Ep. 4: Clean Up Bravo!

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A classmate of Yukinari and the others, Mamoru Machida, appears as a superhero who wants to keep the school clean, and who confronts everyone that tries to litter. Miharu senses how hard he tries, and introduces him to Lilica, Fukuyama's maid, so that he learns how to do a better job. (Source: Wikipedia)