Doppelganger with Demon Summoning System

Forbidden Grimoire Necronomicon falls into the hand of a mortal, cursing him to die of misfortune. However, at the time of death, part of it accepts the mortal soul and fuses with it. With the powers blessed to him by gods, enjoy his adventures in his various reincarnated worlds. -------------------------- Fanfiction based on Shin Megami Tensei Series, Tensei Shitara Slime Datta Ken, and Tales of Demons and Gods