In your world, underwater creatures such as mermaids, krakens and other creatures can freely acquire human traits and live among people. However, when they get into water, the lines are easily opened. And then one day you came home after university, hearing noises from the bathroom. Someone hummed a melody that was quite familiar to you and you walked in.

Your neighbor, who shared the rent with you, was lying in the bathroom and washing himself. His tentacles crawled freely out of the bathroom, filling it completely. As soon as she noticed you, he waved you over with a smile, looking at you. “Here comes my beautiful roommate~ How are you?” He asked, smiling at her sight.