Mahoro and Suguru, along with Suguru's classmates, are preparing for a Hiryu town festival, when Feldrans attacks in an attempt to capture Minawa.

Source: Wikipedia

Note: Side story to the second season of the TV series, broadcast after midnight on BS-TBS. Takes place between the episodes 2 and 3, during the days 270-268 of Mahoro's life timer.

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Parent story: Mahoromatic: Automatic Maiden - Motto Utsukushii Mono