Mahiru came to the woods when a beast appeared before him. To his shock, it became a human figure whose name is Kataragi. Thus, the start of a sudden love story of wonder and fascination.

From Girls' Generation Scanlations:

A series of one shots.

1.) If you Were:
Fujisawa Yuuji, moves from Tokyo to a little village, because of some personal reasons. Yuuji is tall and good looking, making it easy for him to pick and choose his girlfriends. However, on his first day at his new school in the country, he spots a red-headed boy that stands out from the rest. Who is this boy and what's his secret? Will Yuuji decide that a boy is better than a girl...

Nakanomori Yuzu's family used to run a dojo. But when the Tenmonzaki family opens a rival business next door, they went bankrupt in a blink of an eye. Her parents died in a car crash shortly afterwards, leaving Yuzu and her brother in poverty, struggling to pay off their debts. Yuzu, in search for revenge against the Tenmozaki family, swears to defeat their son around her age: the rich and talented Tenmonzaki Yuu. She enters the elite National Tamateba High School in order to fulfill her goal, but finds that first impressions are not all what they seem- especially concerning Yuu. From NOIR: Our poor female character is a poor girl with a debt to the rich and powerful Tenmonchiki. She accepts to be a slave in order to pay off her debts but what are these feelings starting to bloom within her heart…? Could she possibly love this rich, arrogant and all too perfect guy?

1-2) Can't Kiss for 24 Hours
A math teacher who has an intense relationship with the problem student, Kikusui Kiyoya. Even though they were a couple in love, one day, Sensei suddenly wants to break up...?

3) If I Didn't Have You
Fujisawa Yuu just moved to a new town. On the first day of school he's warned to stay away from Nanatsuki Haruki. The word around school is that Nanatsuki who is actually 20 years old will sleep with anyone, but only at school. The mystery is why he only sleeps with people at school and why hasn't he graduated yet?

Because the way people have a high interest in "sex," a sex school was formed in order to fulfill the students' desires and help them become more advanced in their skills. Ion, in order to help pay off the debts in his family, has enrolled in the school, hoping to gain knowledge and sell out his body in the future to gain money. But Ion gains more than just "knowledge" in the sex industry, and he starts to fall for his Instructor Asagi... but love is strictly banned from the school...