Ep. 7: Cold Explosion! The Teacher is a Snow Woman

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Mr. Rascal is hit by a truck and cannot make it to school, so a teacher named Ms. Oyuki is asked to substitute in his classroom. Due to being a yuki-onna, she creates a blizzard whenever she is frustrated or not sure of herself. Soon, the whole classroom is transported to Ms. Oyuki's mental dimension where they have to find a way back home. An evil mole is sent by Sorges tries to capture Chacha, but Ms. Oyuki intervenes just in time in order to protect her students. (Source: Wikipedia)