In a fit of rage, five year old Okumura Rin unlocked his secondary powers, and felt as if he was forced to flee because of it. While sitting in a cemetery tree, a man who claims he's Astaroth tells Rin his real father wants to meet him. Feeling helpless, Rin agreed to go with the man, and so his life in Gehenna begins.
After being cruelly rejected by his friends when they find out he is the son of Satan, Rin Okumura has a talk with Mephisto and decides to leave everyone he knows behind. Two years later, the students of the cram school run across him again, and are unsure about how to deal with the person he has become.
After the blue night, Fujimoto Shiro was taking Yuri and the twins to his hideout but something happened when they are on they way to his hideout and Satan brought him to Gehenna and left the other twin in Assiah. 15 years later, Rin went to Assiah to explore and visit Samael aka Mephisto, then he met the other twin w...