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: the shy Yui Akamatsu, the noisy Sacchan, and the video game-loving Kotoha, 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. [Written by MAL Rewrite]

In the distant past, a war between humans and demons brought about widespread chaos and bloodshed. To put an end to this seemingly endless conflict, Demon King Anos Voldigoad willingly sacrificed his life, hoping to be reborn in a peaceful future. In preparation for their king's return, the demon race created the Demon King Academy, an elite institution tasked with determining Anos' identity when he reawakens. He reincarnates two millennia later, but to his surprise, he soon learns that the level of magic in the world has drastically waned during his absence. Moreover, when he enrolls at the academy to reclaim his rightful title, he finds out that demonkind remembers him differently. His personality, his deeds, and even his legacy are all falsified—masked beneath the name of an impostor. This "lack" of common knowledge renders him the academy's outlier—a misfit never before seen in history. Despite these drawbacks, Anos remains unfazed. As he sets out to uncover those altering his glorious past, he takes it upon himself to make his descendants recognize that their ruler has finally returned. [Written by MAL Rewrite]

Two OVAs released with the 8th and 10th volumes of the original novel. They fall chronologically between the first and second seasons.

What if nations were people? What traits would they have? What would this mean for historical events? Hetalia Axis Powers takes these questions and runs with them, personifying countries into characters. The show takes a comedic and light approach to politics and historical events while educating the viewer. Taking place primarily during the events of World War I and World War II, the story focuses on the Axis Powers and occasionally throws the spotlight onto the tumultuous relationship between the Allied Forces. The Axis Powers feature the titular character North Italy, who is clumsy, carefree and loves pasta; Germany, who is very serious but easily flustered; and Japan, who is stoic but has bizarre interests. Based on Hidekaz Himaruya's widely popular webcomic turned print manga, Hetalia Axis Powers is a historical comedy that pokes lightly at culture, examines the relationships between nations and breathes fun into history. [Written By MAL Rewrite]