A l'Era Taisho, en Tanjiro Kamado és un noi intel·ligent amb un bon olfacte i cor que vivia amb la seva família a les muntanyes i guanyava diners venent carbó, però tot canvia quan la seva família és atacada i assassinada per un dimoni (oni). En Tanjiro i la seva germana Nezuko són els únics supervivents de l'incident, tot i que la seva germana Nezuko es converteix en un dimoni. Sorprenentment, però, encara mostra signes d'emoció i pensament humans. Després d'una trobada amb en Giyu Tomioka, un caçadimonis, en Tanjiro és reclutat per l'Urokodaki per a convertir-se també en un caçadimonis. Així comença la seva cerca per a ajudar la seva germana a tornar-se humana novament.

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?

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.

Un noi sense poders, aspirant a superheroi, es matricula a una prestigiosa acadèmia d'herois i aprèn el que realment significa ser un heroi.