Moonlight Whispers (1999)

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Satsuki and Takuya are high school students who meet at kendo practice, where they bash one another with wooden swords. They begin an awkward romance, but Takuya soon reveals a masochistic side to his desires. He has been stealing Satsuki's soiled clothing and secretly surveilling her while imagining her subjugation of him. Disgusted, Satsuki rejects him -- but he persists, and she discovers her own pleasure in manipulating and humiliating him.