Norifusa Uchida is a NEET living in a nondescript town. The outside world he calls 'Meatspace' has no meaning for him yet he still has desires, the biggest desire being to have a girlfriend. Growing desperate in his isolation he preforms a dark ritual he read online to summon a succubus but what appeared instead was a eerie woman calling herself Izuna.

Izuna offers Norifusa a contract, all he has to do is survive 13 days full of torment, suffering and sorrow, 13 days of hell. If he endures the 13 days without fail she will fulfill his deepest desires.

And so begins Norifusa's last 13 days.