I Became a Demon Queen's Assistant in Another World!?

Kai Tieldich, a shut-in gaming loser in life, has just died from a tragic truck accident and finds himself reincarnated into a near-indestructible homunculus living in the magical world of Solaster; a world at constant battle between Humans and Demons. His goal in this new life? To become the Demon Queen's Assistant and to save the Demon Kingdom from the worst thing a gamer could think of: a [Bad End]!