Shy Kayano musters the courage to confess her feelings to the handsome Kamijo in a love letter, but her plans are derailed when the letter is intercepted by Edogawa Takeru, the notoriously handsome son of the school's principal. The situation takes a turn for the worse when Kayano's mother becomes engaged to Principal Edogawa, forcing Kayano to live with Takeru under the same roof. As she navigates this new and daunting living arrangement, Kayano must find a way to cope with the constant presence of the devilishly charming Takeru, who is now her stepbrother, and the challenges that come with it.
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