In a world where women are hunted as prey by an invading alien race, humanity requires all 15-year-old girls to have their left arms infested with a parasite that has defensive capabilities. This story follow two such young girls coming to terms with this reality.

The rich and powerful Sagiri Kaoru is taking Rin with him because Rin's father owes a one hundred million dollars to his father. Now, he can do whatever he wants with her. Can Rin show him real 'Love'?

Hinata has never had any experience with love for his 19 years of existence, and finally manages to snatch a date with the help of a classmate. With no experience with girls, Hinata asks help from his best friend, Yuuma, who seems to have had many experience with girls, who in turn teaches him how to seduce a girl, but then, something happens?

From Misty Rain Scans

Growing up in a strict old-fashioned household, Nanah has always been rebellious and outspoken. She dreams of living life as a normal teenage girl... But now, at the age of 17, she is forced to marry to a complete stranger! Prequel to Mok Yuna's Honeymoon Diary.

Adventures of Melty and friends that attend an academy in order to become questers!

From Alice Dreams:

Misaki Sakurako is a thirteen-year-old girl who loves ice cream and cherry blossoms. Living alone, she had a weird dream that told her she is the only savior to three young child boys... Strangely enough, she woke up to three handsome strangers who asked her to resolve their dear curse--their bodies will transform if they see any slightly "perverted" materials (posters, pictures, etc.). The only way to prevent them from transforming would be...?

Ichina is a 2nd year high school student. She lives with her mother Youko whom she hates with a passion. After getting dumped by her boyfriend, she ends up having a one-night stand with her best friend Sekitani, who also recently broke up with his long-time girlfriend. Will they become more than friends? And who is the strange guy who's waiting at home with Youko when she gets back?

The desirable Tsuu-chan from Yogoreteru Hima Nanka Nai is a character in this story as well.

13 years ago, an unknown object appeared at Shinjuku. That creature regularly gives birth to a demon. Therefore, our world is being eaten clean.
The military found a weapon capable of fighting these creatures, a special power known as "exex" that becomes part of the human body.

From Chibi Manga:

Hiroko never had the experience of having a boyfriend. She started recently to lie to her childhood friend Tomoko who pretends that she had a lot of boyfriends...

Then Hiroko starts to have feelings for Takeru who's in the broadcasting club like her.
But when she tried to approach him at the school festival she suddenly discovers the truth...

Takuma Miyabe is a boy from an island who moved to Tokyo because his island doesn't have a high school there. However, the ratio of male and female is 1:9. There are too many female students in his class, and as a result, they "flirt" and torture the still innocent Takuma.

It is said, that one can achieve success but by being at the right place, at the right time. Is this really true?Shichiro Kurosawa is a 16 year old Highschool freshman, who is about to find out exactly what it means to be at the right place, at the right time, and the devilish cost.

1-3. After a stranger named Akio pays off Takuma's debt, Takuma finds himself working in Akio's shop, only to realize it's a host club. Takuma believes it's impossible for him to entertain women in such a way, but with proper guidance from Akio, he decided to do his best as an amateur host. Then one day, as Takuma tries to be more intimate with a customer in order to become a better host, Akio attacked him and said, "Do you want to sleep with someone that badly?"
Read on to see out what unfolds between these two men in this gorgeous love story.

4. Sakura and Raji are hosts who work together in the same club. Raji is the No.1 host and a total "King" with women literally falling to their knees begging him for love. Sakura is very nice, but totally cool, collected, and a bit pretentious. Raji keeps trying to hook Sakura, but Sakura is not going to just be thrown away like all those women...

5. Dental Wedding
A wedding agency consultant is desperately trying to match up a "perfect bachelor" with a bride, but maybe the bachelor doesn't want a female bride?

6. Extra
Extra of first two couples.

from fictiondb:
The billionaire's bedroom bargain...

Jack Maguire was turned away from his father's house and has never forgotten that day--or how much he wanted his stepsister, Sally. Now a billionaire tycoon, by a twist of fate Jack's inherited his father's property-- and has an opportunity to get revenge....

Jack has a bargain to make with Sally, who has grown into a beautiful, desirable woman. She can keep her beloved house...if she will be his mistress on weekends!

From Shoujo Crusade:

Miki always gets turned down so she frequently seeks consultation in love from the convenience store's shop assistance Azuma. Will that be all their relationship ever be?

From Bakeneko Scanlations:

Banri is a college student who goes with the flow. One day, he meets a well educated business man, Masaomi, with whom he ends up in bed with. This relationship was supposed to be a one night stand, but Banri confesses that he wants to meet Masaomi again after discovering his cute and honest side.
However, Masaomi tells him that he has a fiancée and will never be meeting Banri again, he leaves by ending the night with those words. Few days later, Banri discovers that Masaomi is actually the heir of a big and well known plutocrat!? With the main story, follows the love story between a station attendant and a divorced business man and the bargaining love between a manager and his secretary.

From MangaHelpers:
Minami Eita lives with his older, book-loving brother, whose long-time girlfriend Arumi is often around the house. Minami tries to get along with Arumi, but the truth is that he likes her much more than is appropriate. Even though Minami doesn't read much, he helps in the library with his bookworm classmate Shinonome Yuuko, who loves short stories. She thinks that while most people want to think of themselves as the hero of an epic saga, short stories are much more like their actual lives. Minami's ordinary life becomes more confusing when he begins to suspect that he has feelings for Yuuko. One day, he finds out her secret--she is actually a published author of short stories! Her publisher wants her to write a novel, and she has enlisted Minami's help in an unexpected way. Minami's teenage life is not going to get simpler anytime soon.

Following the last request of her former-idol mother, Marie began to search for her estranged brother. Her only clues are that he is the son of a man whose initials are M.K., and that he has the same cross-shaped birthmark as she does. In order to search for her brother, Marie entered show business, only to encounter all kinds of trouble!

From Liquid Passion:

Konoe, a high school student, is confused about his sexuality. He meets Hikaru in the sleazy gay district, and sleeps with him. They begin to play at being lovers, but Konoe's heart belongs to Atori, his friend and classmate. Can Konoe come to terms with his sexuality and reveal his feelings to Atori, and where do Hikaru's true feelings lie?

Note: Tokuma Shoten Edition of Rules comes with a new cover, and color insert. It also has Chapter 6 and an new extra called "Naturalist". It *DOES NOT* Have chapter 00 which is present in the previous edition and is a prequel to the story, it retells chapter 1 from Hikaru's POV.

Part of Rules / Hydra Series

"Actually sleeping together but not having any memories of it, or having memories of sleeping together even though you didn't actually do it."

"The Deed" or "The Memory".
If you had to choose one of them, which one do you want?

A story of a man and a girl dressed in white.