大正時代，竈門炭治郎繼承亡父留下的炭業工作，支撐一家七口，在山上過著樸實的生活。某日他做完生意返家後發現全家遭鬼王鬼舞辻無慘屠殺，而妹妹禰豆子變成了鬼。鬼殺隊富岡義勇見狀後本欲斬殺禰豆子，但他在見識到兄妹倆的親情後，推薦炭治郎拜鱗瀧左近次為師。炭治郎經過兩年訓練，學會對抗鬼的呼吸法與劍術，通過考驗加入鬼殺隊。

炭治郎完成首次任務斬殺沼澤鬼後，又接到任務前往淺草，途中他聞到當年家人被殺害時的殘留氣味，炭治郎終於和最初的鬼——鬼舞辻無慘——首次接觸，令炭治郎震驚無慘竟偽裝人類組成家庭。在那之後炭治郎結識與無慘對立的鬼珠世和愈史郎，但突然遭遇到無慘的刺客來襲，解除來襲危機後，炭治郎答應收集鬼的血液要求，與珠世建立起合作關係。

炭治郎接到新任務後，前往傳說中有吃人鬼存在的鼓鬼之家，接續遇見同期的隊士我妻善逸及嘴平伊之助，炭治郎在屋外發現兩個孩子表情十分恐慌，於是前來關心，原來他們的哥哥被惡鬼抓進屋內，為了救回被抓走的人類，進入屋裡的兩人，卻陷入包含十二鬼月「原下弦之陸」響凱在內幾個惡鬼為爭奪稀血而互相殘殺的大亂鬥完成任務後，善逸和伊之助加入炭治郎行列。在結識同伴我妻善逸和嘴平伊之助後，他們前去蜘蛛山支援與「下弦之伍」累的對戰。炭治郎在苦戰之際使出祖傳的呼吸法「火之神神樂」，以及禰豆子覺醒的血鬼術一度扭轉頹勢，最終在義勇助陣下取勝。

由於長期違反隊規帶著身為鬼的禰豆子一同行動，炭治郎被押送往產屋敷耀哉的宅邸進行審判，然而他們早已被產屋敷認可。炭治郎等人在恢復後接受特訓。隨後，炭治郎等人前往無限列車執行下一個任務。

37-year-old corporate worker Mikami Satoru is stabbed by a random killer, and is reborn to an alternate world. But he turns out to be reborn a slime! Thrown into this new world with the name Rimuru Tempest, he begins his quest to create a world that’s welcoming to all races. Broken free from ordinary, stale past life, his fresh adventure in a fantasy world as a slime monster with unique abilities begins.

一位平凡的學生從敵人手中救出一名惡霸後，不僅獲得超能力，還獲准進入一間專門訓練英雄的高校。

Shunsuke Aoba has just transferred to a new school and can’t wait to attend. Excitedly, he sprints to the school but, upon arrival, finds that no one is there. Unfortunately, Shunsuke didn’t know that his first day was a holiday, of all things. However, it seems that he is not the only one on campus. As he is about to eat his lunch, he meets a student named Natsumi. Shunsuke gives her some of his food, and the two strike up a conversation. Natsumi was born as a so-called SL girl, a particularly tall girl. She herself accepts her specialness but is rejected by many of her classmates. How will Shunsuke react to this? Will their initial friendship continue?