Residing within Tokyo’s district of Ueno are the Colors, three individuals who protect their city by performing good deeds and aiding their community. Or, at the very least, they pretend to be the city’s defenders. In reality, the Colors are just three young girls who spend their time playing make-believe and exploring the city. The Colors’ activities are facilitated by the grandfatherly Daigorou "Pops" Kujiraoka, who uses his store’s inventory of knick-knacks to entertain the rambunctious trio. Not everyone is a fan of the Colors though. The local policeman Saitou just wants to deal with his regular duties, but he often finds himself the target of the Colors’ attention, having been made the villain in most of their fantasies. But despite his personal feelings, Saitou always finds the time to go along with the three girls’ games. Even though the Colors do not actually defend Ueno, they definitely help brighten everyone’s day.
Episode 1
The colors track down a cat burglar and help the local shopkeeper solve a mystery to rescue a treasure from a locked safe.
Episode 2
The colors practice to raise their levels, take on the case of the mysteriously closed streets, and save humanity from an eco-terrorist plot.
Episode 3
The colors rescue Sat-chan's mom from a dire fate. Monsters attack the police station. The colors solve another mystery to disarm a dangerous bomb.
Episode 4
Nonoka tries to protect her family's bakery from her older sister Momoka, who wants to turn into an onigiri shop when she inherits it, but fails to make an argument with her quality of bread. Later, Yui participates in a street parade before joining the others in going to a summer festival at her school.
Episode 5
Kotoha discovers a powerful new weapon hidden in a box of toys. Later, when Sat-chan learns about a decades-old scandal involving the elephants at Ueno Zoo, the colors investigate and find themselves fighting a man-eating tiger.
Episode 6
The colors ready themselves for the apocalypse and come face to face with their greatest weaknesses. Later, the team works to live up to the most noble traditions of an honored samurai.
Episode 7
Yui and Kotoha have an awkward conversation while waiting for Sat-chan to arrive, after which the girls go around collecting trash. Later, the girls investigate a peculiar smell and wind up collecting stinky gingko nuts. With the arrival of Halloween, the Colors decide to play a Zombie Game in which Yui must prevent Kotoha and Sat-chan from filling the park with zombies.
Episode 8
Following up on the zoo mystery, the colors investigate ties to potential corruption at the local museum, where they struggle against the dogs of the state. Rumor has it that a potential new team member may be there, who could fill a vitally needed role for the group. Later, the gang returns to the mall, where they learn of a lucrative opportunity to get ahead, and engage in some quick and dirty business tactics to earn their well deserved reward.
Episode 9
The Colors acquire money but they don't know what to spend it on. They later go on a mission to find the perfect place for their time capsule.
Episode 10
As an unexpected snowfall hits the town, the Colors enjoy their snow day by going on a mission to find out who stole a lucky cat statue.
Episode 11
The Colors have a training day with an intense game of hide-and-seek! Sat-chan, as usual, takes it up a notch...
Episode 12
The colors introduce their town and try their hand at being salesgirls.
