第 21 集: Satsuki 與 Yuuto 的約會引發 Beast 的嫉妒，並導致 Karen 與 Aoki 陷入致命對峙。

Satsuki goes on a date with Yuuto which makes Beast grow jealous. Aoki and Karen talk about the following battles, with the former reminding the latter not to fight alone again. During the night, Karen follows Yuuto as they promised a rematch, but Yuuto escapes from her and ends encountering Aoki. As Aoki and Yuuto are battling, Satsuki makes Beast attack Aoki, leaving him inmovilized in a building. Yūto tries to kill Aoki, but he is opposed by an angered Karen. The two of them fight again with Yūto manipulating water and Karen fire. As Yuuto gets his chance to kill her, Karen incinerates herself with him. Satsuki tries to help Yūto, but she is instead killed by Beast's wires. Aoki finds a dying Karen who is happy she could save him. Meanwhile, Yuuto has escaped from the area and dies, remembering that he once told Satsuki that humans' death always make sadder others. (Source: Wikipedia)

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