Sixteen-year-old Kaburagi Wakaba has just married her childhood friend, Minato. As the sheltered heiress to a vast financial empire, she is used to getting what she wants, but the one thing she desires most is right in front of her: a chance to live under the same roof as the boy she has secretly loved for years. The opportunity arises when Minato’s family business faces a sudden bankruptcy crisis. Rather than let him struggle, Wakaba uses her family’s immense wealth to save his family’s factory, but her help comes with a dramatic and unexpected condition: they must get married.

Wakaba and Minato, often called by the affectionate nickname Minato-chan, are the central pair. Wakaba is depicted as a young woman whose strong-willed exterior often clashes with her inability to be honest about her deep affection. Minato is framed as the object of her lifelong desire, a boy who made a childhood promise to marry her when they grew up, though he seems to have grown more distant over time. The story is set within the luxurious confines of Wakaba's wealthy estate, where the newlyweds begin adjusting to their unexpected domestic life. The initial setup is fueled by a classic romantic comedy tension: one-sided love in close quarters. Wakaba’s dream of full cohabitation—eating together, bathing, and sleeping in the same house—becomes a reality, leading to a series of heart-fluttering and shy encounters.

A significant early narrative arc revolves around the reverse proposal. After Minato’s family factory is saved by Wakaba’s intervention, the narrative explores the delicate balance of power and gratitude in their new relationship. Minato feels indebted to her, while Wakaba struggles to turn a marriage of convenience into a real romance, still unable to voice the depth of her feelings. A notable theme woven into the story involves Minao consistently eating Wakaba’s poorly cooked meals without complaint, a gesture of kindness that deepens her affection for him. The plot navigates through various standard romantic scenarios designed to bring the couple closer, including moments that test their bond, such as the appearance of a charming idol rival and instances of jealousy. The narrative ultimately focuses on whether the two can move past their childhood promise and turn their new legal arrangement into a genuine, reciprocal partnership, culminating in a resolution that confirms their mutual feelings.