Ep. 13: Un flashback revela las luchas pasadas y la desaparición de Sonata Kanzaki tras lograr Aurora Rising

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This episode is a flashback in Andy's memories(he is the stuffed bear that Sonata Kanzaki made for Rizumu before she was born). He showed about Sonata's and Rizumu's father Ryuu's past when they just got married. Sonata had lost to a younger Kyouko Asechi and had Rizumu. However even though Sonata had Rizumu to worry about, she wanted to learn how to do the legendary jump Aurora Rising. She went through harsh training. Kyouko couldn't do the jump. When it was Sonata's turn she was able to do it however after being congratulated by Kyouko, she collapsed and slept for a few days. When she woke up, she left Rizumu and Andy and went somewhere else which is still unknown. (Source: Wikipedia)