On a very auspicious summer day, first year middle school student Hajime Yasaka was making a small prank bomb for his school's research project.

After losing his way, Hajime decides to take a break at a local coffee shop and meets Arashi, an older girl who is working there as a waitress.

Now, even though weird things are happening at work, all Arashi can do is think about what has recently happened.

One day, Hajime and crew decide to take some photos of a black-haired girl who is supposed to be the lead in an independent movie.

Sixty years ago, Kaya and Arashi were friends, and just like Arashi, Kaya also has the ability to travel through time.

Kaya and Jun accidentally flash back to the year 1945, forcing Jun to face a secret he's been hiding.