Natsu-iro no Sunadokei

With summer vacation approaching, Koutarou Makimura resolves to confess his feelings to Kaho Serizawa. A mysterious encounter disrupts the order of his days, leaving him slipping between moments of the summer and glimpsing a future he has not yet lived.

When he learns that Kaho will die before school resumes, his hopes of growing closer to her become a determination to save her life. Using what these shifts reveal, Koutarou tries to understand and alter the chain of events leading to the tragedy before the summer he dreamed of becomes irreversible.