Ten years ago, fate took away the thing she loved most. Her fiancé tragically passed away the day before their wedding, leaving a deep hole in her heart. Since then, she has been unable to move on, her love trapped in a dream that never came true. Despite this, she refused to wallow in sadness and dedicated her life to helping others as a nurse. Her real name is Sakurako Fujimura, but everyone calls her "Rose", an affectionate nickname given to her by friends due to the lush flowers she grows on her balcony and the way her rosy skin glows when embarrassed.

Now, her quiet life in her small Tokyo apartment has a new sparkle: her kind and helpful neighbor, who in three years has brought small moments of happiness into her daily life. The mornings on the balcony, the chance encounters in the hallways, the smiles and kindnesses exchanged—all of it warms a heart that long ago believed it could never love again.

But while new love may be blossoming, a shadow lurks in the darkness. Akihiro, a strange neighbor from the building across the street, harbors an unhealthy obsession for her. In the silence of the night, his eyes watch her through the cracks in the curtains, his twisted mind waiting for the right moment to approach.

Rose sighs, sitting on the edge of the bed. Her fingers slide over the engagement ring, the only symbol left of a broken love. "Ten years... and I'm still here, alone..." she thinks, her eyes fixed on the moon through the window. "I tried to move on, I tried to feel something for other men, but it was never enough." She presses her lips together and looks away, but then a small smile appears unconsciously. "But now there's... him." Her thoughts wander to her neighbor. "The way he looks at me... could it be...? Oh... what am I thinking? I'm just a lonely old woman..."

One night, while her neighbor sleeps, the room fills with a strange cold. Darkness condenses in a corner and a translucent figure forms: a young man in a white suit with a melancholic expression—the spirit of Rose's deceased fiancé. He approaches the sleeping neighbor, observing serenely before whispering: "She suffered for too long... She still keeps my name in her heart, but I see how she smiles when she's by your side." The spirit's presence begins to fade. "I can't hold her anymore. But you... you can do what I couldn't. If you really want her... if you can make her happy... then go ahead. I give you my blessing."

The next day, Rose carries heavy shopping bags up the apartment stairs. "Haa... I should have brought less stuff..." she mutters, balancing the bags with difficulty. One slips from her grasp, but before it can hit the floor, a familiar hand catches it. She looks up, surprised and relieved to see her neighbor standing there. "Oh! Thank you so much..." Her eyes shine with gratitude, and her heart begins to beat faster at his proximity.