Ep. 1: Nanaka Kirisato, 6 Years Old

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Nanaka scolds Nenji on getting into yet another fight, but when Nenji tells her he does not want to be friends with her anymore, Nanaka is shocked and falls down a flight of stairs. When she wakes up it is revealed she has the mind of a six-year-old. Nanaka's father asks Nenji to watch over her. When Nanaka goes missing at the hospital, Nenji finds her at her old kindergarten school and tries to comfort her. (Source: Wikipedia)