Raika Galakuchika is a heinous criminal.

The punishment for his crimes is 1,000 years of confinement, a cruel sentence designed to wear down his mind, ensuring he cannot die even if he longs for death.

His body is replaced each time it decays, trapping him in a darkness that stretches into what feels like eternity.

After enduring an amount of time that would drive any normal person insane countless times over, his body, having finally completed its 1000-year sentence, had transformed into that of a helpless young girl.

And cast into an unknown land, completely bewildered, he meets a young girl.

Her name: Momose Kaguya. Her occupation: a "high school girl."

This is the story of a girl who strayed in from another world, and a magician (a shut-in) who has lost everything.

*Award winner of the Netocon 13 Comic Division. Manga adaptation announced.