Sakurako, Shun Hashimoto’s childhood friend and former fiancée in an arranged marriage, endures a public unraveling of their engagement when he comes out as gay during the wedding ceremony. Clinging to lingering romantic feelings, she grapples with his rejection, internalizing it as a personal failure to meet societal and marital expectations. Her journey to Okinawa—ostensibly to relay news of his father’s failing health—doubles as a desperate bid to reconnect with Shun, driven by unresolved longing.

There, she encounters Mio Chibana, Shun’s current romantic interest, and strategically insinuates a fabricated history of intimacy with him to unsettle their relationship. This calculated move exposes her willingness to manipulate emotions to regain footing in Shun’s life. Later, she collaborates in a deceptive plot to mend Shun’s fractured family ties, falsifying details about his father’s condition. Though intended to maintain her relevance to Shun, her interference inadvertently propels him toward confronting his past and committing fully to Mio.

Complicating these tensions, Fumi Hashimoto—Shun’s adopted younger brother—nurtures unrequited feelings for Sakurako, amplifying his hostility toward Shun for spurning her. This rivalry strains familial bonds, particularly as Fumi resists accepting Shun’s relationship with Mio. Sakurako’s persistent presence weaves threads of unreciprocated desire, duty-bound traditions, and the entangled challenges of love and loyalty amid Shun’s path to embracing his identity.