Shiko Shiko game is A game where there are 5 guys masturbating around a girl, the girl can't have sex, there's no penetration, and the guys can rub their genitals against the girl's body.

R-18,漫画,THEiDOLM@STER,theidolm@stershinycolors,shiny,BUKKAKE,ぶっかけ,gangbang