Source
61
68
Akemi Nakajima is a student in the "gifted class" in his high school. After being bullied and beaten by another student who a female student invoked, Nakajima uses his advanced computer skills to create the "Demon Summoning Program." He summons demons to attack the two, but he gets carried away and ultimately kills them. Now sick with the power of the demon realm Makai in his hands, he summons the demon lord Loki. Realizing summoning such a powerful demon was a mistake, Nakajima sets out to reverse the problem he has created by any means.
Alternative
77
After demons break through into the human world, Tokyo must be quarantined. Without power and stuck in a supernatural warzone, 17-year-old Kazuya has only one hope: he must use the COMP, a device created by his cousin Naoya capable of summoning and subduing demons, to defeat the invaders and take back the city. (Source: Kodansha USA)
Alternative
While Japan in desperate situation, 13 "devil survivors" cut deals with devils to obtain abilities to fight against unknown invaders with only 7 days left until a world catastrophe, you need to make crucial decision to survive...