Yamada is a high school student, and a virgin, who aspires to have 100 casual sex partners. Despite this, she soon finds herself pursuing only one boy.
B Gata H Kei is a manga series by Yoko Sanri. It was published by Shueisha and ran in Weekly Young Jump from 2004 to 2011. The story focuses on Yamada who makes it a goal to have sexual relations with 100 different guys. However, her insecurities as a virgin herself lead her to reject every guy who attempts to make a move on her. To overcome this mental barrier, she searches for a “cherry boy”, an inexperienced guy who will be her first. At the bookstore, she falls on her rather plain classmate Takashi Kosuda, and makes him the target of her seductions. The series was adapted into an anime in 2010 by Hal Film Maker.