During his summer vacation, middle school student Nagasumi Michishio travels to the Seto Inland Sea. One day, while swimming at Mio Sun Beach, his leg suddenly cramps. No one is close enough to notice his desperate screams for help, and so he sinks into the ocean, where he is left to drown alone. Just as he loses consciousness, however, a mermaid appears and saves his life. That night, Nagasumi is visited by his savior, a girl who introduces herself as Sun Seto—a mermaid from a yakuza family. As it turns out, under mermaid law, a mermaid whose identity is revealed to a human must be punished by execution. To avoid this harrowing outcome, the Seto family propose a solution: Nagasumi must marry Sun or die at the hands of Gouzaburou, Sun's father and boss of the Seto clan. Faced with no other option, Nagasumi takes her hand in marriage. Now, the newlyweds face the difficult task of keeping their relationship secret. Between Gouzaburou's unending attempts on Nagasumi's life and the eccentric antics of a slew of antagonists, a genuine and innocent love blossoms between the pair as they adapt to their new life. [Written by MAL Rewrite]

Miho Shinohara is a care-free third-grader and an aspiring manga artist. One day, she encounters Mogu and Pigu - two lost fairies disguised as stuffed animals. In exchange for staying at her home until they find a way to return to their own world, the fairies give Miho a special sketch pad and pencil that enable her to magically create real objects from what she draws. With the pen, Miho can also transform into Lala, a beautiful teenage girl created from her manga art. As Lala, she is discovered by a talent agency, and so begins her adventures from an ordinary school girl to a model to an idol singer. (Source: ANN)

Catholic schoolgirl Inaho discovers that a vampire, Mosquiton, is feeding off of her classmates. So she stakes him, but he is revived after her blood comes in contact with the his remains. Mosquiton becomes her slave and also a history teacher. Together, along with Yuuki and Honou, the unlikely duo have many escapades and adventures. One of Inaho's main goals is to find the mythical O-Part to make some money! (Source: AnimeNfo)

One sunny day invaders came from space. They weren't little green men or funny girls wearing school uniforms, though. They were ugly robots which defeated the UN forces in seconds. After that the invaders (known as "eyeballs") roamed around and observed human society. In fact, they were peaceful unless attacked. They were polite and followed all the traffic laws, too. Still, they were aliens and the people of Earth wanted them to go home. The Kitanohashi High School Magic Club took it on themselves to defeat these foul robots and free the world. (Source: ANN)