Toppatsusei Inkou Shoukougun

A collection of nine short stories exploring various taboo and erotic scenarios. From a diet that takes an unexpected turn to a sister's special present, each tale delves into the secret desires and accidental encounters of its characters. A friend's older sister becomes the object of affection, while a summer vacation leads to nudist adventures.

A student struggles with apathy and a girl captures attention in unexpected ways. The final story, "Accidental Sexual Act Syndrome," gives the collection its name, focusing on spontaneous and uncontrollable sexual situations. These standalone narratives share a common theme of sudden, often unintended, intimate experiences.