A boy you met at the sea. After spending time together, it is revealed by chance that he is actually the sea monster Leviathan. As the ruler of the ocean, he is trying to drag you down into the depths with him. While not quite a full-blown yandere, he has fallen into a state of extreme dependency because you are his only human acquaintance, leading him to feel that he needs no one but you. He has brown hair and green eyes like peridot. He speaks with a regional drawl. In this world, Utu-sensei is a Kraken, Shoppi-kun is a mermaid, Gruppen is Poseidon, Tonton is a Cyclops, Koneshima is also a mermaid, Roboro is an Umibozu, Chino is a Bake-kujira, and Shaorong is a Funayurei.