Ep. 1: Keiki Investigates Mysterious Love Letter Found With Underwear

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Keiki Kiryu is a benevolent high school student who finds himself surrounded by attractive female classmates. His ordinary routine is disrupted when he discovers a love letter that lacks any sender details, containing only a pair of panties as the sole clue. Determined to uncover the identity of the sender, Keiki initiates an investigation. He begins by approaching his senior, Sayuki, to gather information and piece together the mystery surrounding the anonymous note and the unusual item left behind.