Kiss dake ja Kaesanai.

Ryoko attends Tsunashi-gakuen, a private school with an entertainment course. One day, Sei, whose nickname is "King of the Entertainment Course", kisses her out of impulse. What's worse, he's younger than her, arrogant, and a player!

Include extra stories:

From What Does This Lesson Lead To
It's about the relationship between a teacher and student. How will their love go and end?
also in Honnou Motto Midaretai

Don't Leave Me
The school prince, Fuyuki, has a secret only Rikka knows and so she ends up being a servant to a snow man.