: Though her role is minor in this specific episode, she appears as a recurring background character often involved in the school's chaotic events.
: Mawari begins to suspect Sun's true nature after she briefly glimpses Sun's mermaid tail following a water-related accident at school. Seto no Hanayome - Episode 4
: Nagasumi spends much of the episode frantically protecting Sun from Mawari's attempts to splash her with water. His desperation stems from mermaid law: if Sun’s identity is exposed to a human, she or the witness must be executed. : Though her role is minor in this