Bleach

The story opens with the sudden appearance of Soul Reaper Rukia Kuchiki in Ichigo Kurosaki's bedroom. She is surprised at his ability to see her, but their conversation is interrupted by the appearance of a "hollow", an evil spirit. After Rukia is severely wounded while trying to protect Ichigo, she attempts to transfer half her powers to Ichigo in order to let him face the hollow on equal footing. Ichigo instead unintentionally absorbs almost all her energy, allowing him to defeat the hollow with ease. The next day Rukia appears in Ichigo's classroom as a seemingly normal human, and informs Ichigo that his absorption of her powers has left her stranded in the human world until she recovers her strength. In the meantime Ichigo shelters Rukia in his home and takes over her job as a Soul Reaper, battling hollows and guiding lost souls to the afterlife realm known as Soul Society.

After a few months of this arrangement, in the sixth volume of the series, Rukia's Soul Reaper superiors find out about her giving her powers away (which is illegal in Soul Society) and send a detachment to arrest her, and sentence her to death. Ichigo is unable to stop Rukia's capture, but with the help of several of his classmates who also possess spiritual abilities and ex-Soul Reaper Captain Kisuke Urahara, he sets off for the Soul Reaper base, located in Soul Society. Once there, Ichigo and company battle against the elites of the Soul Reaper military, and are ultimately successful in halting Rukia's execution.

It is then revealed that Rukia's execution and Ichigo's rescue attempt were both manipulated by Sōsuke Aizen, a high ranking Soul Reaper previously believed to be murdered, as part of a far-reaching plot to take control of Soul Society. Aizen betrays his fellow Soul Reapers and allies himself with the hollows, becoming the main antagonist of the series, and Ichigo teams up with his former enemies in Soul Society after learning that the next step in Aizen's plan involves the destruction of his hometown. At this point, Bleach chronicles the war between Aizen and the Soul Society, a plotline which has not yet been resolved. According to Tite Kubo, the ending of the series is not yet planned out or written.

Bleach contains a massive cast of characters designed by series creator Tite Kubo, which are divided into various factions and fictional races with distinct themes, and described using large amounts of invented jargon specific to the series. All significant characters in the series possess some degree of paranormal and superhuman abilities, and these are explained by their souls generating higher than usual levels of a paranormal energy called reiatsu (霊圧, lit. "spirit pressure"). The three predominant character types in Bleach are humans, Soul Reapers, and hollows.

The humans of Bleach are much like the residents of modern Japan. A normal human cannot see or sense spirits in any way unless that spirit possesses an artificial human body called a gigai, so humanity remains unaware of the existence of the spirit world. Very rarely a human like Ichigo Kurosaki is born who is able to see, interact, or fight with spirits, and others can gain these abilities by exposure to large amounts of spiritual energy, which happens to a number of Ichigo's friends during the course of the series.

The Soul Reapers (死神, shinigami, lit. "death god") are a military order of psychopomps based in Soul Society (尸魂界(ソウル・ソサエティ), Sōru Sosaeti), a sort of heaven. Soul Reapers escort the souls of the dead to Soul Society through the ritual of soul burial (魂葬, konsō). Their other major duties are protecting humans from hollows, and maintaining order in Soul Society. Soul Reapers all possess supernatural powers, which manifest through their zanpakutō swords, and kidō magic spells. Several factions of ex-Soul Reapers are featured in Bleach's story, most prominent among them the members of Sōsuke Aizen's rebellion and the Visoreds, former Soul Society elites who were exiled after obtaining hollow powers. Soul Society resembles feudal Japan, and consists of two major portions: eighty residential districts called the Rukongai (流魂街, Town of Wandering Spirits),which are inhabited by the souls of the dead, and the walled city Seireitei (瀞霊廷, Court of Pure Souls), the home and military base of the Soul Reapers. The Rukongai districts are ordinally ranked, with the lower-numbered districts being more peaceful. Soul Society is nominally ruled by a king, who resides in another realm within Soul Society, but in practice is controlled by the Soul Reapers.

The hollows are a race of evil spirits who feed on the souls of humans, both living and dead. Hollows are created when the soul of a dead human is neglected by the Soul Reapers until it is overcome by loneliness and/or rage, at which point it changes form into a monster with a white mask. By going through a procedure provided by Aizen, they become an arrancar, a hollow which regains the ability to reason, obtains a more humanoid form, and can gain access to Soul Reaper abilities such as the zanpakutō. As a group, the arrancar are the primary antagonists of the Bleach series. When not hunting humans or souls in the human world hollows reside in Hueco Mundo (虚圏(ウェコムンド), Weko Mundo), a dimension between the human world and Soul Society. Hollows are undetectable as long as they remain in Hueco Mundo.