Sex Friend Osananajimi ~Shojo to Doutei wa Hazukashii tte Minna ga Iu kara by Orcsoft (Jap)

A day that shines from brilliant first graders and is on the verge of a summer vacation.
The pair of men and women in the support group, who make up the majority in the class, have a subtle event less than a joint party and less than a joint party.
Seo Yukihisa -You,
A girlfriend who has been known since childhood, but has a small degree, to say from childhood and chest,
Akihara Shiho and the family restaurant were useless.
The story, of course, is about a pair of couples consisting of "Gokon (?)".