Ep. 1: Rito navigates school life while Momo enrolls to build a harem for him.

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Rito is disturbed by the Deviluke aliens and worries about Momo’s deceptive nature. At school, he rejects Lala’s push for confession, citing legal marriage limits. Momo and Nana enroll, with Momo reminding Rito of their bathtub talk. She argues that as the future king of Deviluke, he can take multiple wives, and vows to create a harem to ensure everyone’s happiness. Momo gains popularity among boys, while Nana befriends a mysterious girl named Mea using her animal communication skills. Momo attempts to recruit Yami for her plan, but their talk is interrupted by violent boys attacking Yami. After restraining them, Yami hears a voice reminding her of her true mission as an assassin assigned to kill Rito.