Light Marquinas is a forty-year-old man who has dedicated his entire life to the study of magic, rising to become an S-class mage, the highest rank possible. Despite his immense power and fame, he has had no luck with women and has resigned himself to a life without a partner, having already given up on marriage. However, his desire for a child of his own remains. To fulfill this wish, he performs a divine contract at a church, a ritual that successfully grants him a daughter named Lucia, born from his own blood. Lucia is no ordinary child; she is blessed with divine magic that surpasses even her father's legendary abilities. This development completely transforms Light's existence. The lonely life of a celebrated but isolated mage is replaced by a rosy, fulfilling new chapter centered on raising his daughter. While Light remains a formidable cheat-level wizard to the outside world, easily battling monsters and protecting the kingdom, he becomes a complete pushover when it comes to Lucia. The narrative follows the daily adventures of this cheat parent-child fantasy duo, with the worlds strongest mage acting as the weakest, most doting father to his incredibly powerful daughter.