Lamb Teacher and the Big Bad Wolf

Yuuya Kaga is a high school delinquent. Atsuki Sakamoto is his homeroom teacher. After a fated lunch shared on the rooftop of the school, Yuuya desperately tries to win his teacher's affection. But he always gets turned down. Mr. Sakamoto says it's because they're both men and because he doesn't want to violate the student-teacher relationship. Behind the scenes, however, lurks the ominous specter of a past that he is trying to live down. This is a heartfelt romance between a high school punk and his reluctant teacher. "Just be mine already!"

(Source: Renta!)