Ep. 6: The Birth of Mako-chan

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Chiaki's close friends invite themselves, and later Makoto, to her house to do homework. Makoto develops a crush on Haruka, but his subsequent behavior incurs Chiaki's jealousy and causes him to be banned from the house. Upon hearing of the situation, Kana instructs Uchida to bring Makoto the next day, where she implements her plot: sneak Makoto past Chiaki by helping him cross-dress, knowing he won't be able to refuse. Makoto soon finds himself unable to break out of the deception and its attendant benefits, beginning to slide down the slippery slope. (Source: Wikia)