Mari Maria Winter Nanase is a half-Japanese half-Swedish woman who grew up in affluent families in Scandinavia and America. She is well-liked among girls and possesses good looks. However, she struggles with communicating with men. After reading a book on love in the library, she came across a suspicious advertisement for Love Agency, which promised a professional matchmaker to help her find love. Kon-chan, an agent from Love Agency, appeared on her screen and vowed to assist her in falling in love with her crush, Masaya Seki. Masaya Seki also utilized this app with malicious intentions towards Mari. Their relationship as hopeless lovers remains uncertain.