Amane is a handsome, smooth-talking man who is good at navigating social situations. Sasaki is a boisterous, easygoing guy who naturally becomes the center of any group. They were inseparable friends throughout high school and university, but after they entered the workforce, Sasaki suddenly stopped reaching out. It is only when he contacts Amane again out of the blue that the two meet up for drinks and quickly fall back into their old, easy rhythm. The story follows their renewed, often messy relationship as adults, exploring the space between close friendship and something deeper. Amane's colleague Maruyama has long harbored a quiet crush on him but has kept her feelings hidden, and Sasaki's reemergence begins to shift her dynamic with Amane. Meanwhile, a woman named Yuki, who used to hang out with both of them in college, reappears carrying a secret connected to a past event that strained their bond. After Sasaki is forced to find a new place to live, he moves in with Amane, and the two start cohabitating alongside a stray cat they nickname Chibi. Their daily life together, filled with bickering, domestic mishaps, and quiet moments, brings suppressed tensions to the surface. The narrative moves between the present and flashbacks to their university days, slowly revealing what caused them to drift apart in the first place, and examines whether two people who have always been close can ever truly change the nature of their relationship.