A series based off of the Shin Megami Tensei: Devil Children franchise.

Due to family circumstances, Setsuna Kai is moving to a new city where he's supposed to live by himself in an apartment. As soon as Setsuna arrives, he witnesses a mysterious rain of rocks and barely escapes being crushed by an enormous boulder. Setsuna's new home wasn't as lucky, being completely destroyed by another giant boulder. Setsuna is distraught, not knowing what to do when he's approached by a scientist named Hiromi Kaname. Dr. Kaname's equipment apparently can tell that Setsuna is a "Devil Child", and so Dr. Kaname decides to take Setsuna to his laboratory.

It's time to raise some hell. Setsuna and Mirai possess the Devil Genome, which gives them the power to summon demons. They open the gates of Hades and let loose the beasts within... but it's all to save the Earth from the Devil himself. A spinoff of the acclaimed Shin Megami Tensei video game series.—tms