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Rikka, Chiyo, Sekine and Tsubasa seem like regular middle-school girls, but they all have their own secrets.

Chiyo, despite her normally calm demeanor, is easily worked up. Cute things make her pull all-nighters to pursue cuteness. Ninja-related things remind her of her ninja upbringing.

When visiting a local street food vendor who just can't read the room, Rikka is forced to reveal several new powers that are only mildly threatening to the entire human race.

If you could make a wish come true, what would it be? Change the past? Change your gender? Lose weight? Whatever it is, Colonel Rikka has you covered. She just won't warn you beforehand.

After some ups and downs during the final exams, it's off to summer vacation at the beach. Great weather, great food, and great excuses for excessive self-defense await!

Sekine invites Chiyo to a sleepover at her house, and the other two invite themselves as well. They deepen their bond while Rikka learns more about the quirky cultural activities that take place on Earth.

What was supposed to be a fun visit to the karaoke studio suddenly turns into an emergency when the four friends are abducted by a shadowy organization.

Hanzo, the assassin sent against Chiyo by her former ninja clan, cannot defeat Chiyo in single combat. He decides to cleverly attack Chiyo through her friends, Chiyo's only apparent weakness.

Fuku-chan, Rikka's new space alien pet, has gone missing, and he's not just a harmless walking giant mushroom. Can Sekine stop him from devouring her friends, both figuratively and literally?

The four friends go on a trip to Atami, a resort area known for its hot springs and traditional wooden dolls. However, it also featured an eagle-eyed local who could accurately determine Tsubasa's gender.

Time is running out. The lies are not holding. When the truths comes out, can the four kids remain friends? Can Rikka stay on Earth, without messing with the space-time continuum?