Young elf Aria is an adventurer. She has a cute face that attracts the attention of almost everyone. Her breasts are so mature that they seem ready to explode at any moment. And in the embrace of this breast was a small animal… His name was Tama. At first glance, he looked like a cat, but Aria and her surroundings could not see the truth. Tama was a reincarnated person and his real form was not just an ordinary cat. On the contrary, he is a monster of the strongest S-class, the young Hippo.