Fuu and Rui, who used to be close, but have been a bit distant from each other recently. One day, Fuu encounters a mysterious spaceship and gains magical powers. At that same time, Rui also gains magical powers, and both transform into the adults they dream to be. The sisters' powers come with two conditions: their magic powers can only be used in one year, and no one must know about it. Unaware of each other's secrets, Fuu and Rui become active as idols.

So is this what it means to have roommates now?! Office worker Rinko, 24, lives alone and is secretly an otaku. One day, her apartment gets connected to the two neighboring rooms through a "hole" in the wall. In the room on the left is a fresh-faced yet mysterious guy who is overly-sweet to Rinko. The room on the right is occupied by a guy with violent tendencies who is similarly mysterious... But wait! "I... I think I know him!" Rinko's only source of solitude, her apartment, has been turned upside down. Now, every day is full of heart-pounding surprises!

By the mid-21st century, Tokyo's criminal underworld is ruled by Demon Lords—crime bosses who have undergone ether enhancement surgery, granting them terrifying superpowers. The only ones who can take them down are Heroes, bounty hunters who boost their own ether powers using the drug E3 (E-Three). With legalized killing as part of the job, being a Hero is less about justice and more about survival. Yashiro, known as the Reaper, is one such Hero—an independent enforcer who works alone. That is, until Jougamine, a high school girl and self-proclaimed "apprentice," forces her way into his life. Reluctantly taking her under his wing, Yashiro soon finds himself caught in a whirlwind of deadly conflicts.

The story follows Koichi Asakura, a designer for an ad agency who works hard but receives no recognition. After being dropped from a project, he visits a place from his past, where he met Eren Yamagishi. Eren, meanwhile, is recognized as a genius left-handed graffiti artist in New York, while enduring the struggles that come from her own path in life.