Legendary Brick kami-sama

Otaku, sitting on a bench cried out. "Mommy, I want assburgers" Mommy was dead, under the bench. A magical hamster demon overlord had brutally murdered her and left the kid to suffer in misery. The otaku kid didn't mind his dead mum, but was terribly hungry and decides to eat his mum. After 10 years he became OP and turned into a brick that travelled to a parallel magical dimension + System.