Classroom after school. You find yourself standing alone and realize that you have a strange app on your smartphone. Then, class representative Rei Saionji comes in to lock the door.

A simple game where you tap to score points while avoiding detection by the yankee boyfriend, similar to "Daruma-san ga Koronda" (Red Light, Green Light). Reach a certain point threshold to unlock Free Mode with auto function and no life reduction. Features 2D motion animation with three original drawings and smooth breast movement across three stages.

"Summer Sky Triangle - NTR -" is an RPG where you play as a protagonist striving to become a better man for his attractive girlfriend, Himari, by joining the cultural festival committee. While working towards a successful festival, three men approach Himari with ulterior motives, leading to secret relationships that unfold behind the scenes. Your choices shape the story and the heroine’s fate.