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The school was recently built when it appeared in the series and was reportedly extremely expensive, Umino said Ami was able to attend it due to being on a scholarship. However no one knew that the school was being used by the Dark Kingdom to steal energy with their Crystal Disk. The Disk was said to increased the student's intelligence levels, however it actually brainwashed them. The teacher of the school, an undercover youma named Garoben, gave each of the students their Crystal Disk. After finding the brainwashing program Luna and Usagi went to the school to investigate, once inside Usagi realized what the school actually was. She transformed into Sailor Moon and attempted to taken the youma, but failed. Garoben then tried to attack Ami. Ami however was saved by Luna who gave her the Transformation Pen which allowed her to transform into Sailor Mercury and along with Sailor Moon defeated the youma.