Long story short, Yuri’s (the main male character) sister Yumina needs to be kept happy so that a small mystical being known as a Ho will stay on her head. In order for Yumina to stay happy, Yuri must always be by her side, which isn’t always possible. In order for Yuri to stay with Yumina he must transform himself into a female with the aid of a magical gem during some parts of the day. First transformation about half way through this episode.
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