第 26 集: 長瀨拯救瀨戶一家脫離吉雄的婚姻陰謀，並擊敗他，得以與小太陽在一起。
Nagasumi, Lunar, Chimp, and Kai proceed to rescue the Seto Family and Gang. As they infiltrate the estate, Nagasumi learns that Yoshiuo is planning to marry Sun, using vulgar actions such as drugging her first, much to his dismay. Akeno, realizing the wrongdoing she has caused, decides to fight against Yoshiuo. The Seto Family and Gang manage to bail out and participate in battling Yoshiuo's personal army, joined by Kai, Lunar and Lunar's father. Nagasumi collides with Yoshiuo in an attempt to save Sun, originally overpowered at first. But with the power of love and self-respect he receives from Sun, Nagasumi is able to defeat Yoshiuo. Not only does he expose Yoshiuo's mermaid form, a disgustingly fat catfish, but he also tells Sun he loves her and asks her to stay with him forever, to which she happily accepts. The anime ends with Nagasumi and friends returning to a normal day at school, surprising some with his more "manly" persona, as Sun is wearing a ring given to her by Nagasumi on their first date like a wedding ring. (Source: Wikipedia)