Kyosuke entered high school dreaming of a sparkling, youthful life. However, after reuniting with his older, introverted childhood friend, Kyoko, he is lured into joining the "Imitation Games Club."

The club's activities revolve around sophisticated versions of "make-believe" games like "House" or "Hide-and-Seek"—reimagined as intellectual pursuits for high schoolers. But for some reason, "accidents" keep happening, leading to some very steamy and unexpected developments!

While these boys and girls initially intended to play wholesome games, their childhood pastimes are fast-tracking them into a deeply immoral relationship...?! Playing children's games at this age is naughty, fun, and totally scandalous! An immoral youth comedy begins!