Set in an Asiatic-like world, in which lives certain humans who can manipulate one of the four elements - Earth, Fire, Water, and Air - using telekinetic abilities known as "bending", with these gifted beings themselves being known as "benders". With each generation, there has always been one individual amongst them who is the only being able to manipulate and master all four elements, known as The Avatar, the one who will bring balance to the world and fight for peace amongst the four nations of the world.
After her father passed away, the Hellsing organization was left in the hands of a young girl, Sir Integra Fairbrook Wingates Hellsing, now a woman at age 22, and the last descendant of the Helsing blood line. Her ancestor, Abraham Van Helsing, was the leader of the Order of Protestant Knights, who protected the world from creatures of the night such as vampires, and yes, the Bram Stoker story is true, Abraham Van Helsing did indeed kill Dracula, but instead of killing him permanently, Helsing turned Dracula into his servant, who to this day remains the Hellsing Organizations most powerful weapon against any and all threats.
At the end of the series, we saw Tanjiro, Inosuke, and Zenitsu, finish their rehabilitation training at the Butterfly Mansion, in the secret Headquarters of the Hashira, the most accomplished of all Demon Slayers, but there is little time to waste, as our heroes have been sent on an important mission to aid the Fire Hashira with a demon problem on board the train bound for Mugen. However, the task will not be an easy one as the group will soon discover.
The concept of a hero who can defeat any foe with one singular punch seems like someone was just trying to make an overpowered hero with zero chance of character progression. It may seem like you'd get bored with every foe being ended with one punch, but in all honesty...it's a lot of fun to watch as the series goes on, because the hero himself gets tired of being so strong and unbeatable.
Tanjiro Kamado is a young teenage boy who shows nothing but kindness to anyone and everyone he meets. For years he has lived a happy life with his widowed mother, three young brothers and two younger sisters, but all of that changed when Tanjiro returns home one morning to find his family murdered by a demon. Everyone, except for his sister Nezuko is slaughtered, but Nezuko alone is instead transformed from a human into a demon.