haru shibasaki, a second-year employee in the merchandise department, is pure, sincere, and has a strong core. she holds a black belt in karate and is a master in calligraphy. the gap between her appearance and reality is insane. sex was incredibly erotic. she loved kissing, fellatio, penetration, and deep throating. for the development of a new product, an onahole, she makes a decision to analyze her vagina as sample data.