Becoming A Demon In Another World

After being mistakenly killed by the someone during a friend's party, Lux found his soul transmigrated into a frail 10 year old boy in another world. Shocked by such revelation, Lux tried to recall the boy's memories only to find nothing. What's left on him was ragged clothing and an eerie black demon mask with bloody red words engraved inside. [Forsake your humanity! Become a demon!]