Mr. Rascal is hit by a truck and can not make it to school, so a substitute teacher—Ms. Oyuki—is asked to substitute in his classroom. Unfortunately—due to being a yuki-onna—she creates a blizzard whenever she frustrated or unsure of herself. Soon, the whole classroom is transported to Ms. Oyuki's mental dimension where they have to find a way back home. While there, an evil mole sent by Sorges tries to capture Chacha, but Ms. Oyuki intervenes just in time in order to protect her students.