Ep. 6: Mawari Suspects Sun Is a Fish After Water Spill Incident
Aired on May 7, 2007

Following an accidental water spill on Sun by the Class Rep, Mawari observes Sun's tail and deduces that Sun is a fish. She proceeds to attempt splashing Sun repeatedly to confirm this hypothesis. Nagasumi intervenes to protect Sun from these actions. Simultaneously, he struggles to save Mawari's life due to the mermaid code of law. The situation escalates as Nagasumi balances defending Sun while navigating the legal constraints imposed by the mermaid society that threaten Mawari. This sequence highlights the conflict between Mawari's persistent theory and the protective measures taken by Nagasumi amidst the supernatural rules governing their interactions.
Episodes
- Ep. 2 · Nagasumi protects Sun's tail during their Bon festival date
- Ep. 3 · Nagasumi and Sun face an assassination trap on a deserted island.
- Ep. 4 · Sun and Maki move into Nagasumi's city home while he retreats to the attic.
- Ep. 5 · Sun and Nagasumi face a school staffed by Sun's family and gang posing as teachers.
- Ep. 6 · Mawari Suspects Sun Is a Fish After Water Spill Incident
- Ep. 7 · Nagasumi encounters Lunar Edomae, who reveals her mermaid form and seeks to enslave him.
- Ep. 8 · Nagasumi proposes a singing contest to resolve the escalating school conflict involving Maki.
- Ep. 9 · Kai Mikawa, an agoraphobic merman, challenges Nagasumi for Sun's hand in marriage.
- Ep. 10 · A powerful man stalks Nagasumi while Sun intervenes and Gouzaburou fights Lunar's Papa.