Blanc, a devout sister, is burdened with huge debts due to the deficit of the orphanage she runs. Kuro, the demon who broke the seal by chance and became one with her, proposed a way to repay her debt by going to the city at night and selling her body…!

Starting with sexual entertainment at a bar, she gradually became a prostitute and then a street prostitute. As the places where spring is sold become more extreme, where will Blanc’s sexual desire bloom into the lust hidden in her voluptuous body…?
And what will be her relationship with the demon Kuro, who has become one with her…?

A devour sister’s daily life transforms into a day of lust and depravity…