In the latter half of 21st century, humans leave the Earth and begin to live in space. In order to adapt to the environment in space and deal with the hostile aliens in Jupiter, genetically engineered children called "Princes" are artificially raised and trained to be pilots of armed robots "AHSMB (Advanced High Standard Multipurpose Battle Device). This is a story about one of the teenage "Princes," Hitachi O Izuru, who studies in an academic city Grandzehle. (Source: MAL News)

The story revolves around William, an aristocratic family's progeny with rare intellect. One day, his uncle lost his possessions after his business failed. Fearing that his family's name has been tarnished, William returns home and searches with his family's butler for anything that can be converted into cash. A search of the premises yields an underground room left by an ancestor. In the room is a magical seal, and William unintentionally summons a devil. The summoned devil tells William his name Dantalion, and reveals that William is the designator who can choose the acting ruler of the demon world. (Source: ANN)

Fifteen years have passed since the war between humans and demons began. Dissatisfied with their slow advance into the Demon Realm, the Hero abandons his companions to quickly forge ahead towards the Demon Queen's castle. Upon his arrival at the royal abode, the Hero makes a startling discovery: not only is the Demon Queen a woman of unparalleled beauty, but she also seeks the Hero's help. Confused by this unexpected turn of events, the Hero refuses to ally himself with his enemy, claiming that the war the demons have waged is tearing the Southern Nations apart. However, the Demon Queen rebuts, arguing that the war has not only united humanity but has also brought them wealth and prosperity, providing evidence to support her claims. Furthermore, she explains that if the war were to end, the supplies sent by the Central Nations in aid to the Southern Nations would cease, leaving hundreds of thousands to starve. Fortunately, she offers the Hero a way to end the war while bringing hope not only to the Southern Nations, but also to the rest of the world, though she will need his assistance to make this a reality. Finally convinced, the Hero agrees to join his now former enemy in her quest. Vowing to stay together through sickness and health, they set off for the human world. [Written by MAL Rewrite]

In search of true love, Kanako Miyamae transfers to Ame no Kisaki Catholic school, inspired by how her parents fell in love with each other there. There is just one difference, though: because men make Kanako break into hives, she has actually come to the all-girls school to find a partner of the same sex. When she meets the beautiful Mariya Shidou, Kanako believes she has found that special someone; however, there's more to Mariya than meets the eye—it turns out that Kanako's first love is actually a cross-dressing boy. Mariya threatens to expose Kanako's impure intentions unless she keeps his real gender a secret, and to make things worse, he also replaces her original roommate so that he can now keep a close eye on her. Maria†Holic follows Kanako as she looks for love in all the wrong places and searches for the girl of her dreams—that is, if she can survive being Mariya's roommate! [Written by MAL Rewrite]