High schooler Kana and her besties Mossan, Hijiri and Pets live unremarkable lives until the day a mecha falls out of the sky along with a strange woman named Haruko, whose plans for Kana and her friends involve the force known as "ATOMSK."
Depressed Kana flips over the collection of photos she took with her besties; the next day, the three girls gather by the beach to watch the rocket Pets is supposed to be on depart.
One hot summer day while playing in the pool, the four girls and Haruko notice that Pets is missing; Kana later hears from her classmate Aida that Pets' family is very rich, and they are moving to Mars.
The four girls watch Sasaki's basketball game; Haruko makes out with Sasaki, which triggers Kana's NO to activate.
Kana learns that Mossan is working on a fashion contest and feels the urge to help her, which rubs Mossan the wrong way.
Kana and her besties witness Hijiri kissing a college student, Toshio, inside his car; acting more mature than any of her classmates, Hijiri suggests that Kana and her besties do a photo shoot with Toshio.
Kana Koumoto, a cheerful 17-year-old, can often be a klutz and nosy; one day, while hanging out with her best friends, Pets, Mossan and Hijiri, they start making a rocket using empty soda bottles.
