Tomohiro Takabe is suprised one day when Mina Hayase tells him she wants to be more than a friend. Instead of being her boyfriend, Tomohiro is going to be her "sexfriend". With the help of the school nurse, the two spend their days in the nurse's office. The two then decide to further their friendship by trying out some new ways.

A boy and a girl who are friends are caught in a once in a lifetime sexual encounter now there both addicted to one another's bodies. one day after school while they were having sex another girl walked in and sees them she becomes jealous but eventually they let here in so they have a threesome.