Takumi is nursing his wounds after his third failed relationship of the year, wallowing in familiar disappointment. His childhood friend and roommate Ren, a steady and kind presence in his life, listens patiently to Takumi’s ranting. In an unexpected moment, Ren suggests they try dating each other. Perhaps tipsy and seeking comfort, Takumi agrees, and the pair embark on an experimental romantic relationship.

The story follows Takumi and Ren as they navigate the uncertain space between friendship and romance, a trial period filled with dates, hugs, and kisses. Initially, Takumi is confused by the unfamiliar intimacy, but as Ren remains consistently warm and attentive, Takumi begins to gradually realize his own growing feelings for his longtime friend. The central conflict revolves around the question of what distinguishes friendship from love, as two earnest young men explore this new development in their relationship through trial and sometimes error.

Set in a contemporary slice-of-life environment, the narrative focuses entirely on the evolution of their domestic and emotional bond. Over the course of the story, the pair test the boundaries of their connection, moving from the initial awkwardness of their agreement to deeper emotional vulnerability. Ren, characterized as serious and punctual, contrasts with Takumi, who is portrayed as clumsy when it comes to love. Their journey together forms a single cohesive arc chronicling the tentative steps from being childhood friends to becoming genuine partners, culminating in a sweet resolution where love is finally acknowledged.