Best friends Yuu Sonoda and Haruka Takayama have been inseparable since middle school, but starting high school seated on opposite sides of the classroom leaves them with less time together. To keep their bond feeling special, the two start secretly kissing, and the manga follows how that private habit reshapes their friendship as classmates Kaede Ikeno, Yuzu Iizuka, Kotone Noda, and Shizuku Minami drift in and out of their daily routine.