This is the story of Mitsuki Fukuo, a middle-aged virgin with no experience, and a physique that is undeniably that of an old man.

Fukuo, who worked as a teacher at a certain school, was troubled by his life. He was ignored by those around him and had almost no experience with women. Everyone who saw him would say in unison, "Dirty old man..." He was used to hearing it, but a large hole had opened up in his heart.

One day, on his way home from school, he was fed up with everything. As he was walking absentmindedly, a truck suddenly came crashing towards him. He stood there, unable to do anything, and his body flew into the air.

"This is it, I'm dead..." he thought. His short life flashed before his eyes like a revolving lantern. And in a slow-motion-like time, Fukuo made one last wish.

"If I'm ever reborn, please let me live a life where I'm popular with girls."