Bokutachi wa Shitte Shimatta

From Aka Roze Tenshi: Kaji Kotori is a shy girl and was always bad at making new friends, especially with guys. Since the start of high school she has been made fun of by Kaji Yukito who's the center of attention of the class. Rumors are that he was a delinquent during middle school but he doesn't look like one. Here comes the life of Kotori and how she adapts to love.