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Mitsuki and Yuya suddenly become half-siblings after their parents get married. Their relationship is tense and tense—until one day, Mitsuki is possessed by the spirit of Hiyori, who claims to love Yuya and believes she is the key to him reaching heaven. The problem? Hiyori puts a chastity belt on Mitsuki and forces Yuya to help with her strange ritual. Can they survive this chaos, or will they fall in love in the midst of a trance? Get ready to chuckle and be charmed in this unexpected romantic comedy!