Yami Baito-saki wa Isekai deshita

High school student Ryuji Hashiba takes a suspiciously lucrative part-time job to reclaim the goals he set aside while paying his mother’s hospital bills before she passed away. Following his employer’s instructions, Ryuji steps through a hidden door and emerges in an unexplored world. Before he can make sense of his new surroundings, monsters ambush him.