Monster Girls in the Divine Weapons World

I ran into a lobster monster and got killed with one punch. After I transmigrated, I found myself reduced to a pebble the size of a bottle cap. Was it because a lousy student like me didn't deserve to get a System? All I got was a passive skill that looked completely useless. No way. I'd rather die right here, even jump off this cliff, than be a stone nobody would ever look twice at! Ah! This is great!