Spring 1999. Admiring and wanting to be a cute maid, a young girl comes to Akihabara. The end-of-the-century "Akiba" is filled with a wide variety of maids. The maid cafe "Ton Tokoton," commonly known as "Butagoya" (Pig Hut), is open today as well! I was in a panic because the new maid who had joined the store with me was quite unpredictable. Maids, trainers, and other Akihabara life forms appear as well, and the red bat swings into action! This is a full-fledged maid's work struggle diary, given to all masters and ladies. "We are waiting for you to come home, boo."

For as long as she could read, Eliana Bernstein—more commonly known as the "Bibliophile Princess"—has preferred the company of books to that of people. However, as a noble, it is her duty to find a suitor. Fortunately for her, Crown Prince Christopher Selkirk Asherald proposes a deal: He will protect her free time, and, in exchange, Eliana will be his fiancée in name only. The years they spend together are bliss, as Eliana learns to open herself to others. But all good things must come to an end. For Eliana, who loves books more than people, ending their fake relationship should be no big deal. But as Christopher grows close with another girl, Eliana begins to realize that she isn't as indifferent to him as she once thought.

The story is set in the future on the planet named Amoi which is controlled by a supercomputer named Jupiter. Among the mostly male human population, the light-haired elite class is allowed to temporarily keep the dark-haired "mongrels" as pets. One elite member, Iason, encounters a mongrel named Riki in the slums and decides to take him in. However, Iason keeps Riki longer than it is socially approved, and rumors abound about their possible relationship.

Ancient Japan is under attack by powerful beings called "Kamikui," and it is up to the "Oni" and his band of eight beautiful female warriors to stop them. Each of these girls have unique skills, abilities, and personalities. They partner themselves with the Oni, Jin, to stop the miasma of darkness sweeping across Japan. Onigiri follows the escapades of Jin and his merry companions as they strengthen their bonds and fend off the demonic invasion.