Yukako Furugun is a school girl who attends a certain school. She is a class president and class president, and she has a boyfriend in a long-distance relationship. However, for some reason she decides to live with her childhood friend, Bob Tanaka, who is a half-foreigner. Moreover, if you notice it, it's a relationship of sex friends! She is of course secret to her boyfriend. I can't say ... "Okay! I have to say it! 』\ ... and she gets squid with Bob's big cock today. She is the class president who has become a daily routine for tomodachi sex. Can she really hide her from her boyfriend! ??