An apartment building somewhere in Tokyo. An incredible orgy is taking place there. The protagonist of the night is Unpai-chan. She is a cunning girl with breasts that can hold any man's attention and a sweet voice. It is a well-known fact that cunning women are not popular with the same sex, but she is loved and adored by men, and she is so cute that she can make any man weak in the knees. In fact, if you drink with this girl under the same roof, before you know it, everyone's dicks will be sandwiched between her big breasts.