From Midnight Scans:
Akira, a student of the music department, played the violin only for Ibuki who is her teacher and lover. Akira is entirely devoted to Ibuki while Ibuki's love devours all of Akira to where she has lost the distinction of herself. She believed that Ibuki was her entire world. That was until she met Seike Hayato, a classmate who is the complete opposite of her. An intense, sad love story unfolds on stage in the world of classical music.

Contains 5 stories:

1. Erotic Trigger
High-school student Koyata can't keep his hands off girlfriend Yoshino, who always turns on his "trigger". While she loves him, she still wishes for a little more romance than the clueless and indelicate Koyata provides. Now her birthday is coming up and she's determined to have a romantic evening.

2. Liar Trigger
Lingerie designer Akira is very honest, which is great for his work but terrible for his love life. Assistant Ririko has feelings for Akira, but knows that no woman will be more important than his job. Can she handle being just friends?

3. Mint Trigger
Student Yumi is under alot of pressure and relieves her tension through vices: smoking, drinking, and sex with her prep school teacher Shigemura. Though she loves being with him, they have to keep their relationship secret and can't see each other often. Fellow student Sekiguchi is hanging around though.

4. Vibrating Trigger
A straight-laced student representative gets more than she bargained for when she confiscates a vibrator from an errant classmate! Though she's still trying to figure it out when the owner comes to retrieve it.

5. Summer Trigger
It's summer break and the student representative has nothing to look forward to but studying. A chance meeting with the errant classmate leads to a night of debauchery and fun.