About a kid who's getting bullied then his childhood friend rescues him. Later they are sucked into a video game world by God. While they are in that world bullies act like theyve become good and his childhood friend is about to be sacrificed. He tries to save her but it turns out that it was just a plot by the bully and his childhood friend to sacrifice him instead also the bully and her are dating.

It's Dungeon Seeker i believe