How do you know you're immortal? Obviously, you only find out after you've died.
Unable to die, Sakuragawa Kuro, while faced with a fateful choice, joins an intervention team at Hijikata Toshizo's invitation, all for the money.
Later, he is entrusted with raising Tachibana Kanade, the daughter of a fallen captain.
Iwanaga Kotoko, the yokai's Goddess of Wisdom, believes he is the one she'll spend her life with and pursues him.
By chance, he gets his hands on a Rubik's Cube known as a Calamity Artifact. The next day, a blue-haired little girl appears and curses him as soon as they meet.
The immortal Sakuragawa Kuro realizes that these women are just like parasites: they want to "eat him up."
They want his body.
