A mysterious boy can only be found on a small mountain during autumn. Resembling the tree he inhabits, the tall young man possesses dark blue hair and a calming aura. By chance, a little girl named Akino stumbles upon him. The boy introduces himself as Konoha and reveals that he is a tree spirit with an intangible body. Soon, a pure and unique bond develops between the two. Each autumn, Akino visits the mountain and stands before the tree, reuniting with Konoha after what feels like an endless wait. Yet, despite their unshakable love for each other, fate may not be as kind as they hope.