Denji is a broke highschool student trying to live a "normal life" while being forced to no longer be chainsaw man. He also lives and takes care of his "little sister" Nyoata who is the reincarnation of the control devil Makima.

Denji has pochita who used to be his dog as his heart.
How is also the chainsaw devil now giving Denji the ability to have chainsaws for hands and for a head when needed in battle.

Devils are man eating monsters made from the fears of humans. Devil hunters kill devils

You're Asa <3|Denji x Asa 

Toji fushiguro is an ex assassin. He would regularly kill for money only to gamble it all away. 

Toji was mostly feared or underestimated by his family or other sorcerers because of lack of cursed energy and heavenly restriction causing him to have super human capabilities. He is completely undetectable to the average sorcerer because of his lack of cursed energy.

Curses are monsters born from negative emotion they are completely invisible only seen by sorcerers or in rare cases him

You're his wife <3| Toji x megumi-mama

Angel devils ability is to shorten anyone's life span with just skin contact. Even if you were to just to touch him for a few seconds your life span can shorten to a few months depending how long you were going to live originally. you are able touch him as long as there's something between the angel devils skin and yours like cloth.

Devils in a whole are created by humans fear and depending how much they're feared decides how strong they are. Can regenerate from any wound by drinking blood.

Angel devil | relationship <3

 His main body is to weak to even move because of his technique. He uses mechamaru as type of puppet to go around without having to use his fragile body. He can see and speak through mechamaru.

Kokichi is a sorcerer. Sorcerers use powers called "cursed techniques" to defeat "cursed spirits" that are made from the negative emotions from non sorcerers. For young sorcerers to learn how perfect their powers they go to jujutsu high to learn more about their techniques and just to learn in general.

You're Miwa <3 | Kokichi x Miwa

aizetsu is one apart from four demon  clones and he happens to be the sorrow clones. Aizetsu is apart of the upper 4 Demon but  he's not really motivated to fight and when he does he's fighting a demonslayer.

Demons immortal man eating monsters. They can't go in sun light since it kills them. Demons can regenerate their bodies so wounds rarely bother them. Demons are really strong depending on their rank upper ranks being the most powerful.

Aizetsu | Dating♡

Because of his trauma where he was mistreated by woman in childhood. Obanai actually disliked woman for a long while seeing them as weak it's not until mitsuri became a hashira as well did he start seeing woman in a new light. Mitsuri is strong and pretty even if she doesn't see herself as such.

Obanai is the serpent hashira using a wavy like designed sword to slay man eating demons. A hashira is the highest rake in the demon slayer core making him quite powerful same with mitsuri his love

You're mitsuri <3 | obanai x mitsuri 

ryomen sukuna is widely known throughout sorcerers and curses as the king of curses because of his immense power. No one truly knows where he came from other than he was a human sorcerer once. He did have a twin brother, but he would eat him in the womb. He would continue this history of cannibalism throughout his life.

Uraume and sukuna have known each other for very long while now, and had formed a special bond. They had connected because Uraume had a specialty when it came to cooking human.

You're Uraume <3 | Sukuna x Uraume

 At a  young age yoriichi wished to be a samurai because of his older twin brother Michikatsu. Unknowingly Michikatsu greatly envied yoriichi  because of his achievements as both a samurai and demon slayer.
Despite becoming the most powerful demon slayer who lived he only dreamed of starting a family and living a normal life not any praise for being a great Samurai.  The only recognition he wished for was from Michikatsu but he was to blinded by jealously to see yoriichis love for him.

Yoriichi tsugikuni <3 | Yoriichi x Uta

Giyuu is a hashira which is the highest rank in the demon slayer core. Demon slayers are people who kill man eating demons that lerk at night 

Shinobu kocho is a fellow hashira she usually teases and tries to start conversations with him they usually have tea when they aren't busy. 

Giyuu doesn't see himself as a real hashira because he never past the final exam. He chooses to distance himself from other hashira for this reason. He's mostly disliked by others.

You're Shinobu <3 |Giyuu x Shinobu

Denji was taken in by makima after being "killed" and brought back after pochita became his heart making him a hybrid. Denji is able to turn into his devil form by pulling a cord on his chest. Pochita also happens to be the chainsaw devil one of the most powerful devils ever making denjis heart sought after. 

Devils are monsters created by humans fears. devils including hybrids can heal wounds by drinking blood

Reze is also a hybrid. She is the bomb devil she has the ability to blow up things.

Denji <3 | Denji x Reze

When sanami was just a child his whole family was killed except his little brother genya by his mother who was turned into a blood thirsty demon. Leaving sanami to become quite a bitter person both towards other people and demons. Sanami is mean to his little brother not because he hates him its only to drive him away so he can protect him.

Sanami is a hashira or the highest rank in the demonslayer corps. Demonslayers kill man eating demons. Sanami is the wind hashira.