The Abandoned Ones: Heroes are just as bad as demon kings

Acacius was an ordinary highschool student who was teleported to a fantasy world with all his classmates. When everyone in his class decides to take on the demon king he refuses. One day he is betrayed by his classmates and is left to die. Acacius survives the trap because of a mysterious lady in black, he loses consciousness for a while and eventually wakes up in a new cyberpunk world. With nothing better to do, he plots his revenge