A normal looking high school girl on the outside, Kusakabe Maron is actually the reincarnation of Jeanne d' Arc. With the help of the angel, Fin Fish, Maron works as the thief Jeanne at night to seal the demons that reside in pieces of artwork, preying upon the weak hearts of the owners. She is branded as a thief due to the fact that the artworks disappear after she seals the demons. One day, a new neighbor and classmate appears, as well as a rival in her night job, the thief Sinbad. With her own best friend being the detective's daughter, out to capture her and the appearance of her new rival, Maron's work is anything but easy.

Brothers Lucifer, Mammon, Leviathan, Satan, Asmodeus, Beelzebub, and Belphegor are among the most powerful demons in the Devildom, serving as officers on the student council at the Royal Academy of Diavolo (RAD). However, being avatars of the seven deadly sins, their behaviors often tend toward the extreme. Their everyday antics belie their high status and fearsome reputations among others of their kind. When viewed behind the scenes, the members of this family are more lovable—and laughable—than they first seem!

Usagi Tsukino is an average student and crybaby klutz who constantly scores low on her tests. Unexpectedly, her humdrum life is turned upside down when she saves a cat with a crescent moon on its head from danger. The cat, named Luna, later reveals that their meeting was not an accident: Usagi is destined to become Sailor Moon, a planetary guardian with the power to protect the Earth. Given a special brooch that allows her to transform, she must use her new powers to save the city from evil energy-stealing monsters sent by the malevolent Queen Beryl of the Dark Kingdom. But getting accustomed to her powers and fighting villains are not the only things she has to worry about. She must find the lost princess of the Moon Kingdom, the other Sailor Guardians, and the Legendary Silver Crystal in order to save the planet from destruction.

Usagi Tsukino and her friends have been living peacefully until they are called into action again as Sailor Guardians, planetary warriors fighting for the peace of the galaxy. Usagi, also known as Sailor Moon, leads their group into battle when a new threat from beyond the stars presents itself: two survivors of an alien race, An and Ail. In order to save the source of their life force, the Makai Tree, An and Ail begin harvesting energy from unsuspecting humans. The Sailor Guardians must stop their plot or face the annihilation of Earth. But as one threat subsides, another follows—this time in the form of a little girl from the future who seeks the source of Sailor Moon's power to save her family. However, she is not the only one vying for it, as a group known as the Black Moon Clan also wishes to obtain the power and use it for nefarious purposes. In order to protect their destinies and the harmony of the universe, Sailor Moon and the rest of the Sailor Guardians must fight to stop these forces from succeeding.