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Mirei, an 18-year-old design student, lives with her fiancé, Mano, a strikingly handsome heir to a business empire. Having accepted Mano’s proposal upon high school graduation, Mirei prepares for their upcoming wedding while navigating her studies. The couple, still shy about physical intimacy, faces the challenges of transitioning from a chaste relationship to married life. Their daily interactions are filled with tender moments and mutual support, but a charming neighbor, designer Tani, begins to stir complications. As Mirei balances her dreams and insecurities, she and Mano work to deepen their bond amidst new tensions.