Yamada, first name withheld, is a 15-year-old girl who has just entered Takizawa High School. Easily considered exceptionally beautiful, she has only one problem with her own body, she thinks her vagina looks weird and is very self-conscious about it. 
Upon entering high school, her dream was to have casual sex with 100 men but therein lies the problem, she believes an experienced partner will tease her about the way her vagina looks or simply the fact that she's a virgin. She stumbles upon the solution in the form of Kosuda Takashi, a fellow virgin, whom she believes will help ease the transition to more experienced partners. 
There's only one small problem, Yamada doesn't know anything about sex or the ancient art of seduction, meaning her quest to conquer Kosuda will be a difficult one.

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A 4-panel manga. 
Yamada has a goal when she enters High School. She wants to make 100 sex friends, but she's got one small problem: she's a virgin! Afraid of being rejected or ridiculed by hot guys, she decides that in order for her to reach her goal she first has to lose her virginity. While in a bookstore looking for a new dictionary she bumps into Kosuda, a very average boy, and decides he's the perfect candidate to get the job done. 
Will Yamada succeed in getting Kosuda to bed, or will something more bloom from the not so innocent start to their relationship? 
Note: This entry contains 15 extra chapters.

Kaori Sakai