That Time I Got Reincarnated as a Slime

Only 39 years into a life full of bad luck, Ryoma Takebayashi passes away in his sleep! Taking pity on him, three divine beings show compassion by reincarnating him as a young boy to a magical, new world. Now he spends his time researching and caring for slimes in the forest. But after healing an injured traveler, Ryoma decides to set out with his new friends on a journey to use his power to help others. A whole new world awaits him, where his skills as a magic user and slime tamer continue to elicit surprise and admiration.

After a demon attack leaves his family slain and his sister cursed, Tanjiro embarks upon a perilous journey to find a cure and avenge those he's lost.

After dying of overwork in the real world, I’m reincarnated as an immortal witch, and I spend 300 years enjoying a relaxing life. At some point, though, I end up at level 99! All those years spent killing slimes to make the money to pay the bills gave me a ton of experience points. Rumors of the level 99 witch spread, and soon I’m up to my ears in curious adventurers, duelist dragons, and even a monster girl calling me her mom! I’ve never been on an adventure, but I’m the strongest in the world… What’s going to happen to my relaxing life?!

As a legendary hero nears victory against a necromancer known as The Corpse God, things take an unexpected turn with the dark sorcerer’s final gambit—reincarnation magic. This last-ditch effort catches the brave fighter off guard, and now he’s a boy named Polka Shinoyama in a whole new world! The showdown between good and evil just got epic.