The story begins with a cliché: a powerful sorcerer meets his end and is reincarnated as Prince Lloyd de Saloom, the seventh son of the King of Saloom. Unlike typical isekai protagonists who lament their lost power, Lloyd is ecstatic. Why? Because being the seventh prince means he is far down the line of succession. He has zero political responsibilities, no pressure to become king, and complete freedom to pursue his one true love: magic.

Lloyd retains all the memories and forbidden knowledge of his past life as a Grand Sorcerer. However, he is reborn with a tiny body and a childish face that belies his ancient intellect. The core premise is watching Lloyd deceive everyone around him with his innocent appearance while secretly experimenting with ancient, dangerous spells that could destroy the kingdom.

The "kimama" (気まま) – meaning "carefree" or "selfish" – part of the title is crucial. Lloyd does not want to save the world. He does not want revenge. He wants to dissect a demon's core, reverse-engineer a curse, or blow up a mountain just to see what happens. The plot only escalates when his reckless experiments attract the attention of demon lords, cursed mages, and royal conspiracies that force him to reveal his terrifying power.

In a genre crowded with overpowered heroes and generic fantasy trappings, Tensei shitara Dainana Ouji datta node, Kimama ni Majutsu o Kiwamemasu stands out like a supernova. It’s not just another isekai—it’s a joyful, chaotic, and visually stunning celebration of one thing: magic for magic’s sake.

The series is ongoing. Recent chapters have introduced the concept of "Demonic Runecraft" and Lloyd’s eventual confrontation with higher-dimensional beings. The title promises he will master magic "at his own pace," but external threats—including a prophetic doom involving the other six princes—are accelerating that pace.

Will Lloyd ever take the throne? Unlikely. He finds politics boring. Will he become a god of magic? That seems to be the inevitable path.

For English readers, the official translation of the manga is available on Kodansha USA (via K Manga app and website) and various other digital retailers. As of 2025, the light novel is also being translated by J-Novel Club.

Be cautious of pirated sites. The series is notorious for low-quality fan scans that cannot capture the intricate artwork. To truly appreciate Kokuzawa’s illustrations, always support the official release.

The story begins with a mediocre mage in modern Japan who dies in an accident. In his final moments, he laments that he didn't have enough time or talent to master magic. A god, hearing his wish, grants him a reincarnation with a cheat ability: he retains all his memories and is granted "Trinity" magic—a power that defies the laws of the world.

He is reborn as Prince Lloyd, the Seventh Prince of the Saloum Kingdom. Because he is the seventh in line for the throne, he has no political responsibilities or expectations. He is free to do exactly what he always wanted: dedicate his life to researching and perfecting magic.