: Shima brings Isaki home to live in his bathtub. As they spend time together, their relationship evolves from a simple companionship into a deep romantic bond, forcing Shima to confront his insecurities and the difficulty of a relationship between two different species.
: Shima’s struggle to move past his "perfect student" persona and embrace his true feelings is a recurring emotional arc. Kono Danshi, Ningyo Hiroimashita.
: In a dazed state, Shima confesses his crushing loneliness to the stranger. The merman, whom Shima eventually names Isaki , vows to stay by his side as long as he is needed. : Shima brings Isaki home to live in his bathtub
: The central theme is Shima’s journey from isolation to self-acceptance. Isaki serves as a catalyst, helping Shima realize he is not an "unwanted child" and that he is strong enough to believe in himself. : In a dazed state, Shima confesses his