My childhood friend got a boyfriend, so I started making lunch for another girl, but then my childhood friend started acting strange.

Ken, the protagonist, has secretly loved his childhood friend Akari since they were little, their families sharing a close bond.

But one day, Akari starts dating Yasaka, the most handsome boy in school.

Realizing this, Ken is terribly dejected, but he finds comfort in Takatsuki Chiharu, whom he met by chance, and manages to pick himself up.

Day by day, Ken and Chiharu grow closer.

Meanwhile, Akari, sensing the presence of another woman from Ken's behavior, starts to act strangely...