Starting with a Bug Exploit: The Mage Who Became a Wise King

[Lighthearted, Not Heavy] [Lots of Wild Ideas] [Invincible] [Genius]

Reincarnated into a noble family, Kane lives in a kingdom where noble titles can only be inherited for three generations without meritorious service. As a fourth-generation heir, Kane has no choice but to start preparing for life on his own.

After discovering his talent for magic, Kane uses all kinds of loopholes to create many spells that defy common sense, quickly making a name for himself.

He gathers dragons, retainers, princesses, and members of other races, and becomes the ruler of a kingdom and a city.