Twins Yuuta and Yuuki Asaba have been inseparable from childhood friends Shun Matsuoka and Kaname Tsukahara since kindergarten, and their tight-knit group only grows when half-Japanese transfer student Chizuru Tachibana joins their high school class. Nothing dramatic happens to this group of five: no rivalries, no grand romance plots, just the small, ordinary moments of a friendship that's already lasted years. Told across loosely episodic chapters, it's a slice-of-life series built entirely on how comfortable these five are with each other.