Rohan Kishibe accompanies Kyoka Izumi, a Manga magazine editor, to a buy house at a village far off from civilization. They soon discover the village is home to a group of millionaires who had all mysteriously become rich at the age of 25. Rohan and Izumi enter one of the houses, only to realize they they are trapped by a mysterious power that won't let them progress unless they follow specific rules lest they suffer the consequences.

After an incident forcing him to pause his series Pink Dark Boy for the summer, Rohan had decided to take a vacation in Italy. In Venice, Rohan accidentally entered the priest's compartment of a confessional in the middle of his research. Shortly after, a man entered the booth and confessed his sin to Rohan, believing him to be a priest. Interested, Rohan heard out his confession.