Arifureta Shokugyou de Sekai Saikyou

Hajime Nagumo regards his pastime as the most significant aspect of his life. He and his class unexpectedly find themselves in a different universe where children have extraordinary abilities one day. Hajime, in contrast to the majority of kids, has learned the useless Synergist skill. The child was unhappy until he became lost in a dark dungeon and realized there was a use for this sort of seemingly pointless expertise.