Summer Storm!

Thirteen-year-old Hajime Yasaka relocates from modern Japan to the countryside to live with his grandfather, and a wrong turn leads him into a café called Ark. There he becomes instantly taken with a waitress named Sayoko “Arashi” Arashiyama—until a sudden change in her demeanor after she takes his hand leaves Hajime wondering what, exactly, he’s gotten involved with.

Arashi isn’t an ordinary girl at all: she’s the spirit of someone who died during World War II, and contact with a man she’s “connected” to allows her to slip back through time. Thrilled to finally have a partner who can trigger that ability, Arashi enlists Hajime to help her intervene in the wartime tragedy that ended her life, aiming to save civilians caught in the chaos. As Hajime follows her into the past, it becomes clear that Arashi isn’t the only person with ties to time travel.