Hiel was ridiculed for having a useless crest and was exiled to a remote island. When he grabbed an pickaxe to reclaim the island, the true effect of his crest was revealed. With his production cheat he will reclaim this uninhabited island and start his life in paradise.

In a world where aptitude for magic is determined by a crest. At the age of seven, Alec, the sixth prince of the sacred Luxian Empire, was given a crest of [Dark Magic], which is said to turn him into a demon as soon as he uses it. Scorned by those around him, Alec became a shut-in in the palace, and in the last days of his life, he used [Dark Magic], which he had never used before, in the hope of getting a good glimpse of it. However, Alec's crest was actually a special one that allowed him to use [Dark Magic] without having his body taken over by a demon! He died as he was - but when he woke up, he was back to his childhood! Reverting back to his seven-year-old self, Alec uses [Dark Magic] to turn all kinds of demons into his dependents, and together with his strongest companions, he builds an ideal country..!