17-year-old Ichirou Satou always happens to find himself in perverted situations with his teacher, Kana Kojima. Follow this erotic love comedy about how student and teacher handle their mishaps.

Notes:
Nande koko ni sensei ga!? began as a series of 4 oneshot chapters titled "Golden Times".
The oneshot prequels are included as chapters 1-4 in the volume 1 tankobon.
Following the oneshot chapters, the series continued with chapter 5.
Each volume of the manga is focused on a different student-teacher pairing.

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Links:

Author's Twitter

Anime on ANN

A volume collection of sweet, short and fun 4 pages manga for everyone to enjoy and adore.

An omnibus collection of interconnected short stories by Douman Seiman.

1. Junjou Erotica (Pure Erotica)
Heartbroken by her first love, senior high year 2 student Rika develops a fear of romance. One day, she finds out her first love's weak point! From then on, she starts her revenge...

1.5. Passionate Erotica (not scanlated)

2. Renai Teppen Shugi (Romance Summit Principle)
The two most popular people in school, Rinko and Shirou, are pretending to be a couple to keep people from confessing to them. Rinko is slowly falling in love with Shirou, so what happens when someone finds out about their fake relationship?

3. Romeo na Kanojo (My Girlfriend Is Romeo)
Seiya was the prince of his school until a new girl, Ryou, transferred in. "If I can't win against her, my only other option is to make her fall for me!"

4. Ouji to Kiss to Nemurihime (Prince & Kiss & Sleeping Beauty)
Shiya has a phobia with boys. What can she do, but ask the almighty ?prince? of the school for help? The prince is shocked that this girl doesn?t like him, and decides to make her fall in love with him! But Shiya has a weird curse: every time a boy touches her, she faints!

Collection of short stories:

Koi ni Ochita Oujisama (The Prince Who Fell In Love)
"Just thinking about it makes me want to cry. Do you know the kind of love I'm talking about?" Shiho lives next door to a prince. Toshiki-sama is the heir of a Noh music master. They shouldn't have been anything more than childhood friends, but...

Cinderella no Tegami (Cinderella's Letter)
Mashita has always been annoyed by one particular guy, in all her years of going to one school, and it just so happens he's the only person she knows in her new class.

Busu (The Ugly One)
Maki got a little arrogant, thanks to her looks when she was a child, and her confidence takes a downhill ride when Hideo-kun, her crush, calls her ugly due to peer pressure.

Iroha ni Hoheto (Old Way of Reading the Japanese Alphabet)
Kiyomi goes to her childhood friend; Atsushi, for love advice; whose face she says she's gotten sick of.

Pizzicato
A girl who has no talent, Miki, has a crush on an up and coming violinist who attends her school, and thinks it's a waste of time to tell him her feelings, since she might be moving soon.

Sara is a member of the Heaven Expedition Team, and her job is to hunt Devils, but she hasn't caught even one devil yet and if she doesn't catch one she will be expelled!

She decides to summon a devil so she can catch him, but what will happen when she meets the charming devil Rembrandt?

Also contains:
Midnight
Blooming Love

Following each chapter is a small side story. The fourth side story remains untranslated.

A volume of cute and romantic short stories:

Caramel Milk Tea
Nozomi, a high school student, did not believe in love at first sight. But it happens that she is in love with a cafe clerk. Immediately she declares love to him. But because he gives her the cold shoulder, she is disappointed in love. Now she begins to work part-time for the cafe where he is working.

Futari no Jikan (Two People's Time)
Eri hangs out with her childhood friend, who she hasn't seen in four years. They've changed over the years, but certain feeling have stayed the same.

Kirakira no Kimochi (A Sparkling Mood)
Narumi tries to make the most of her time before she moves on Christmas Day, but falls unexpectedly in love.

No. 1 Girl
Saiko must choose between her career or her love.

Orange Kiss contains Happy Words, a prequel of No. 1 Girl.

Ch. 1 - Oni x Mountain Goddess
Ch. 2 - Welcome to the Zoo Bar
Ch. 3 - The Sacrificial Bride

A collection of short stories:

1. One Day In The Life of Ivan Dejavu - Business Jump (Shueisha) 1986 March

2. Fangs of the Sea - Weekly Shounen Jump (Shueisha) 1979 January 25th Extra Edition

3. Emperor of Winter - Young Magazine (Kodansha) 1996 July

4. Alice (Part 1) - Comic Tom (Shio Shuppansha) 1985 August

5. Alice (Part 2) - Comic Tom (Shio Shuppansha) 1985 September

6. Alice (Part 3) - Comic Tom (Shio Shuppansha) 1985 October

7. Hunters at Dawn - Weekly Shonen Jump (Shueisha) 1976 Issue 28

8. Lightning Strike - Monthly Shounen Jump (Shueisha) 1975 August

9. A Tale of Seven Cities, Battle of Pell Strait, Extra Chapter - Tanaka Yoshiki Doku-hon (Hayakawa Shobo), 1994 September 30th

The enormous cave system, known as the Abyss, is the last unexplored place in the world. Nobody knows how deep down goes this titanic pit, inhabited by strange and wondrous creatures and full of mysterious ancient relics which purpose in unknown to modern man. Generations of bold adventurers have been drawn by the cryptic depths of the Abyss. In course of time those brave enough to explore the dangerous pit came to be known as "Delvers."

In Orth, the town at the edge of the Abyss, there lives a little orphan named Riko, who dreams of becoming as great a delver as her mother was and solving the great mystery of the pit. One day, exploring the murky depths, she stumbles upon a little boy who turns out to be a robot…

Unofficial compilation of twitter oneshots with hashtag #魔女集会で会いましょう

Table of Contents
Spoiler

Comics based on stories by Yasutaka Tsutsui (science fiction author who previously wrote The Girl Who Leapt Through Time and Paprika). Two volumes long.

Probably one of the most difficult feats in manga is to tell a compelling short story, and Mitsuru Adachi is a master of the medium. This selection of some of his best short works include two tales in the dangerous life of a pretty private-eye-to-be; a boy's stop-off on the way changes his life's destination; five short-shorts in a quirky cafe; Japan's future ace pitcher can't even throw a ball; when a school play goes bad, the world is a stage for love and karate; a drama of rugby and past lives; two off-beat time-travel tales; and more! Mitsuru Adachi's low-key but high-impact stories are a must read for any manga aficionado.

This collection, titled simply Short Program, collected stories by Adachi published between 1985 and now.

Spoiler

A collection of stories.

1. Koi (Love)
2. Himitsu Shoujo
3. Yuri Kago (The Yuri Cage)
4. Planet Aimer-lis
5. Suki ni Sasenaide (Don't Make Me Fall For You)
6. D x Drops (Dream Drops)

Parfait Onee loli Anthology 1

Story 1 Aria’s Egg ( Hachi Itou)
Story 2 My Friend’s little sister (Namori)
Story 3 Melon Melon ( Jin Takemiya)
Story 4 Because I’m an adult (Yuu Nonaka)
Story 5 the taste of the first kiss ( irua)
Story 6 Leave it to the Super Maid ( Eku Takeshima)
Story 7 Princess Knight and Familiar ( Saku Takano )
Story 8 The Mistress’s Selfishness (Subaru Homura)
Story 9 An Angel’s Poison (Ichie Ichigo )
Story 8 Words that make me so happy ( Pikachi Ohi )
Story 9 I want that girl (Tama Tamasaki)

Parfait Onee loli Anthology 2

Story 1 Yuuri’s Sensei ( Eku Takeshima )
Story 2 Momo-chan comes to my house everyday (Ameno)
Story 3 I’ve fallen off Mr. Raid (masaru fujieda)
Story 4 My Sister’s reason is great (Tatsumi Takano)
Story 5 Teacher tell me/ Teacher please (Jin Takemiya)
Stroy 6 I want to be your memory (tMnR)
Story 7 That girl is a chicken (Tama Tamasaki)
Story 8 Shirimichizu (Subaru)
Story 9 I don’t need a voice (irua)
Story 10 and someday again (Moe)
Story 11 Children and children (ogi)
Story 12 I will (Nagashiro Rouge)
Story 13 Saki-chan is too cute (Gyumaro))
Story 14 translucent girl gene (Iwami Kiyoko)
Story 15 sister’s secret (Hachi Ito)

Webcomic serialized on Rakuen Le Paradis' website from 2009-2016. Contained in the first half of Junsui Luminescence, an anthology collection.

The daily experiences of modern monster girls.

Original comic by Shepherd0821, uploaded to MangaDex with permission.

A collection of Houkai Gakuen 2 stories.

This is a collection of one-shots from Dowman Sayman. It contains short stories about serial killers finding love, historical figures brought back from the dead, a clever take on the the September 11th attack, yaoi fan-girl ghosts making suggestions to the men she watches, and everything in between.

A collection of short stories:

The Distant Dawn - Weekly Shounen Jump (Shueisha) 1975 Issue 34

The Steel Queen - Weekly Shounen Jump (Shueisha) 1975 April 28th Extra Edition

Escape from the Wastelands - Weekly Shounen Jump (Shueisha) 1975 Issue 39

Funeral Convoy - Monthly Shounen Jump (Shueisha) 1976 March

A Call from Afar - Weekly Shounen Jump (Shueisha) 1978 September 15th Extra Edition

Whiteout - Weekly Manga Action (Futabasha) 1979 Super Fiction August 31 Extra Edition

Amazons of the River - Weekly Shounen Jump (Shueisha) 1977 September 10th Extra Edition

The Carneades Plan - Weekly Shounen Jump (Shueisha) 1976 August 20th Extra Edition

Algae (Part 1) - Monthly Bears’ Club (Shueisha) 1990 August

Algae (Part 2) - Monthly Bears’ Club (Shueisha) 1990 September

Lightning Strike - Monthly Shounen Jump (Shueisha) 1975 August

Emperor of Winter - Young Magazine (Kodansha) 1996 July

One Day In The Life of Ivan Dejavu - Business Jump (Shueisha) 1986 March

Alice (Part 1) - Comic Tom (Shio Shuppansha) 1985 August

Alice (Part 2) - Comic Tom (Shio Shuppansha) 1985 September

Alice (Part 3) - Comic Tom (Shio Shuppansha) 1985 October

The Distant Dawn won the 9th Tezuka Prize in 1975.

A collection of BL stories that take place in a world with six genders (Omegaverse).

Xiaomi, an omega, has been in love with the popular Jiang Xi, an alpha, since middle school... Even though they both changed over the years as they graduated and started living different lives, Xiaomi's feelings have not changed. It is painful to experience an unrequited love for 10 years, is it not? But what will happen when Xiaomi brings an intoxicated Jiang Xi home to his bed after their university's graduation party, knowing that Jiang Xi will soon be going abroad?

STatus: Dropped. Has an official translation.

Français:
Spoiler

A collection of surreal oneshots with a garden theme.

Story 1, Mansion Aquarium: A sick boy finds himself in an usual situation.
Story 2, Eureka Garden: A girl with a wild imagination is enchanted by a garden.
Story 3, The Garden of Me: A young wife copes with a troubled marriage.
Story 4, Two Guys in a Garden: A student gets way more than he bargained for when he visits his professor’s house.
Story 5, A Gardener’s Day Off: A man has a peculiar encounter on his day off from work.

A yuri anthology of office ladies.

Volume 1
Story 1 Aiming for the happy end (Kishi Torajirou)
Story 2 First Love Toilette (Moto Momono)
Story 3 Minimum Romance (Kanarase)
Story 4 Lily hara! (Naoko Kodama)
Story 5 Return home (Nagashiro Rouge)
Story 6 One colour of purple inestine flowers (Takenoko)
Story 7 Office senior, who is me (Yayoi Osawa)
Story 8 10 years of love (Kabayama)
Story 9 Insensitive cute person (JIn takemiya)
Story 10 I hide my little finger on marble (Yodokawa)
Story 11 It's important to encounter a missing miracle
Story 12 My possible 2-17 ID (Yukichi Nakamura)
Story 13 A storm is coming (Yushui)
Story 14 Adult's Etosu Tora (Tokwotsumu)
(From MU)

Toile is a WEB Yuri Anthology.

The person I like. I want to know everything about the person I like. Because I like him. Because I like her. Everyone undoubtedly holds the desire to know more about the person they like. Within the varying types of love, this form exists as well.

2. Marine Blue Marriage by Aion Kiu
"At death's door in the middle of the sea, I encountered the Sea God..."

7. Rakuen Paradise by Yamamoto Tomomitsu
Alone with a ferocious monster... If you were the one who died...

8. The Cowardly Demon's Love Sickness by Mada Madara
"I couldn't help falling for that earnest boy!"

Your "thing" is making me unable to hold back! It's an all out fetish story collection!

1. Ms. Margaret's Secret Workshop
Story: Oreun Yong Satang
Art: Yoolseo
Description: ...

2. Love and Fever
Story/Art: Yeo-Ing
Description: Junwoo was asked by his lover, Hayun, to fill in for him for his part-time job. But, Junwoo felt that there was something stange with him so he headed for his place. Upon arriving, Junwoo found Hayun in a... strange state?

3. Maid Serial Murder Case
Story/Art: Gojo
Description: ...

4. Something Sweet and Bloody
Story/Art: King Prawn Sushi
Description: ...

5. Why I Fell for You
Story/Art: Reumi
Description: ...

6. Unfixable
Story/Art: InNin Description: HyeonYeong decides to end his life and he climbs up a mountain to do it. But just when he was about to commit suicide, he receives an SOS, and the sender is... a tiger? Isn't that shiny "thing" over there so beautiful?!

7. Am I an "Iljin"?
Story/Art: Kkomi
Description: ...

1. Iya! Shi, Iyasare?!
Artist: Niyama
Description: A masseuse jokingly offers an erotic massage to a regular client who has ED due to a previous trauma, but the client unexpectedly accepts?!

A variety of confined, after school worlds.
An omnibus peering into the personal, everyday lives of young boys and girls' ambiguous youth.

The stories are situated to a research laboratory where the people who are alive and not infected by the disease try to survive while an overwhelming amount of zombies roam around the research facility, making it impossible to escape.

1: Yours, Even After Death 「死後も君のもの」 – Usui Ryu
2: That Man, Being A Mortal 「その男、死に損ないにつき。」– Chihaya Hino
3: Bottom Of The Pitch Black Darkness 「真っ暗闇の底の底」 – Hohagi Aki
4: Dead Dead Love Alive 「デッドデッドオアアライブ」– Kimura Hidesato
5: The Man Who Died Twice「二度死んだ男」 – Kashio
6: The Last Human 「最後の人間」– Katoh Muw
7: The Two Of Us & Clear Weather「ふたりぼっち日和」 – Machino Suteinu
8: Zombie Cycle 「ゾンビサイクル」– Homerun Ken

"How about we get everyone together every two years?" Minoru had asked brightly on the night when Mars seemed so close and huge in the sky.

That was the promise that the four members of the Astronomy Club made back then. They would have never imagined that two days later, Minoru would die in a car accident. The remaining three of them decided to honor their promise with her and meet up every two years.

A story full of nostalgia, that focuses on those days of youth that cannot be returned. A story of young love and its faith as time passes by and life goes on - things that never stop for anything.

In a swimsuit, a bunny girl, and clothes that kill virgins.
A little naughty anthology comic of girls in various situations and costumes by 9 writers!

A collection of short one shots from Jump's RomCom Festival

An anthology, with 9 stories of the Gensokyo girls presenting their own food and drinks of choice.

8. Muenzuka Sweet Pickled Ginger - Komachi gets the Three Fairies stealing ginger buds, and gives them both work and a lesson for that.

9. Baked Cheesecake and Pu-erh Tea - The Crown Prince wants to take a courtesy gift to Eientei. She initially wants to take a dessert of heavenly virtues, but ends up settling for a earthly one with probably even greater virtues.