Demon Slayer

Demon Slayer: Kimetsu no Yaiba is a Japanese anime television series produced by Ufotable, based on the manga series of the same name by Koyoharu Gotouge. It follows teenage Tanjiro Kamado, who strives to become a Demon Slayer after his family was slaughtered and his younger sister, Nezuko, is turned into a demon. The series premiered on April 2019, having aired on Tokyo MX and other networks (first season only), and is currently airing on Fuji TV (second season onwards). In North America, it is licensed by Aniplex of America, and streams on Crunchyroll, Hulu, and Funimation. The English dub of the series aired on Adult Swim's Toonami programming block in the United States.

List of Seasons :

Season 1 : 26 Episodes
Movie and Tv Ep : Mugen Train Arc
Season 2 : Entertainment District Arc
Season 3 : Swordsmith Village Arc
Season 4 : Hashira Training Arc

Hashira

Hashira is the highest rank that Demon Slayers can obtain in the Demon Slayer Corps. Those who hold the position are regarded as the most powerful and skilled combatants in the entire organization, protecting humanity against more dangerous threats that cannot be handled by other Demon Slayers. The Hashira are all assigned a specific region that they are required to patrol, usually to gather information about the demons inhabiting said area and to improve their swordsmanship. They are also deployed on missions only if lower-ranking members are unable to complete it. Each Hashira is the master of a unique Breathing Style, some of which are even created by themselves. Interestingly, swordsmen who can use Flame Breathing and Water Breathinghave become Hashira in every era, with no exceptions thus far.

Demon Moons

The Twelve Demon Moons are Muzan Kibutsuji's elite group of Demons. They are the twelve most powerful Demons under his command and are his personal servants. Each of the Twelve Demon Moons have received some of Muzan Kibutsuji's blood and the stronger they are the thicker his blood will be, which further increases their abilities.
The Twelve Demon Moons are given three main tasks:

Finding the Blue Spider Lily. This is a key ingredient in an experimental medicine made by a genius doctor in the Heian period. A prototype of this medicine is what turned Muzan Kibutsuji into a Demon.
Finding the location of the Ubuyashiki family’s base of operations and destroying the Demon Slayer Corps. Muzan Kibutsuji’s relatives, the Ubuyashiki family, are the leaders of the Demon Slayer Corps, which is a great thorn in his plans.
Finding Nezuko. After discovering that Nezuko is able to walk in sunlight and is immune to the Demon’s greatest weaknesses, Muzan Kibutsuji wishes to absorb her so he would be able to walk under the sun as well.

These 12 Moons are divided into 2 Groups:

Upper Moon
Lower Moon

Upper Moons

Upper Moon One: Kokushibo
Upper Moon Two: Doma
Upper Moon Three: Akaza
Upper Moon Four: Nakime
Former Upper Moon Four: Hantengu
Former Upper Moon Five: Gyokko
Upper Moon Six: Kaigaku
Former Upper Moon Six: Daki and Gyutaro

Lower Moons

Lower Moon One: Enmu
Lower Moon Two: Rokuro
Lower Moon Three: Wakuraba
Lower Moon Four: Mukago
Lower Moon Five: Rui
Lower Moon Six: Kamanue
Former Lower Moon Six: Kyogai