Shokushu-kun

A slime-like creature that lived in secret by the water, feeding on grass seeds, frogs, and lizards. That is you. One day, after coming into contact with a dead man’s body by the water’s edge, you acquire enough intelligence to converse with humans. Furthermore, upon discovering that you can evolve by attacking human women and using their bodies, you are reborn as a tentacled creature. Driven from the waters, you roam the city and begin attacking girls, but… Somehow… the girls in this town are a little strange.