The elf girl Aria is an adventurer. She has a lovely face that attracts almost everyone. Her breast is ripened to the point of almost exploding. And then being embraced between those breast was a little animal… His name was Tama.

He looked like a cat at a glance but Aria and her surrounding companions failed to notice a fact. Tama was a human who had reincarnated and his true form was not that of an ordinary cat. Instead, he was a monster of the strongest class, an extremely young Behemoth.