قسمت 12: لونا برای تقویت درسی نزد ناگاسومی می‌رود اما در حین جلسه به‌طور تصادفی به یک ماهی‌زن تبدیل می‌شود.

Sun and Nagasumi's mom leave the house to go shopping for groceries, leaving Lunar alone with Nagasumi. Lunar aims to make Nagasumi tutor her, since she is failing all her subjects. It is then that Maki witnesses the two seemingly flirting with each other, even though they both deny having feelings for each other. Lunar then accidentally spills water on her legs, converting her in mermaid form. Unfortunately, Lunar's Papa shows up just as Nagasumi finished drying her rear end to revert her back, thereby giving the wrong impression. Ultimately, Nagasumi's life is spare after Lunar confesses her newfound feelings for him, and, in turn, Nagasumi winds up being engaged to Lunar. (Source: Wikipedia)

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