Kumano Genkotsu

A boy named Ruisha is trapped in a distorted space created by the ancient hero. What he finds there is the Demon King and the Dragon King, who should have been defeated by the hero 300 years ago. Ruisha befriends the Demon King and the Dragon King, and is trained by them, going from a weak child to a legendary warrior with the power of both demons and dragons. Using his power, Ruisha escaped from the strange place and was accepted into the magic academy where the hero’s descendants live. And now he will have to face many challenges to free the Demon King and Dragon King.

"My son, Wilbert. I banish you from this Imperial capital—!" The Fifth Prince Wilbert did nothing but lock himself away to research magic. One day, the Emperor suddenly sentences him to banishment... but far from despairing, Wilbert is overjoyed! "Now I can immerse myself in my research without anyone getting in my way!" he thinks. Exiled to a remote frontier, he is finally free to deepen his studies and begins inventing one outrageous spell after another! From summoning the most powerful demon to serve as his familiar, to successfully achieving the supposedly impossible "Fusion of All Attribute Magics," he inadvertently transforms into an unprecedented mage—?! The unrivaled tale of the Fifth Prince who unknowingly becomes the strongest begins now!!

Reincarnated into the Demon King's castle?! Magic developed using programming skills! And even the Demon Kings recognize that magic——?Alt Official Raw: niconico Manga

Third Prince Theodulf has been banished to a wasteland known as the Land of Death because he didn't receive a gift from the Goddess. It's a barren land where the air is so noxious, nothing can grow there. Surviving there is impossible... or so everyone thought! As it turns out, Theodulf is a reincarnated being and has received a power known as "Auto-Craft" from the Goddess. Using this powerful gift to automatically create everything, the prince proceeds to turn the Land of Death into one brimming with life!! (Source: K Manga)

"Getting a job is the grave of life..." sighs Tanaka Makoto, an office worker belonging to a black guild, as he takes on a dungeon for work again today. One day, he makes a mistake in the broadcast settings for recording work, and broadcasts his dungeon capture to the whole country. A single blow from the Tyrant Dragon?! Tanaka, a sword master in the modern age, shows off his extraordinary skills, and the broadcast turns into a festival! "100 million concurrent viewers...?!" Tanaka, who unexpectedly becomes an incredibly popular broadcaster, quits his black workplace and becomes an independent broadcaster.

Prince Callus Leditzweissen is a Taboo Being, an unfortunate soul born with a deadly curse that causes him constant suffering. With no known cure, the doctors say Callus only has six months left to live. But a magician named Gourley gives the boy a sliver of hope when he demonstrates the healing power of light magic. Callus is determined to learn how to use light magic in time to save himself, hoping to live longer to repay all the kindness he’s been shown throughout his life.