Summer, ghosts, and my feelings for you.

Yamano is a second-year high schooler in love.
One day, out of nowhere, the very object of his affection, Tanigawa-san, appeared in front of him. As a ghost.
It seems that she died after being involved in some kind of incident.

To save Tanigawa from death, Yamano gets busy trying to change her future, but—…
A vague and fleeting youthful mystery.

(Source: Mangadex)