Boku no Kawaii Musume wa Futago no Kenja

Elcan, a dark mage known as the Twin Sage, was dismissed from his adventuring party for his inability to master destructive spells. Wandering aimlessly through the city streets, he stumbled upon a pair of abandoned twin girls. Though he had failed as a combat mage, a new purpose ignited within him—to give these children the loving home they deserved. Leaving his adventuring days behind, Elcan devoted himself to raising Corona and Selena as his own daughters. He nurtured their innate magical talents, eventually securing their admission to an elite magical institution. Years later, the twins returned home with astonishing revelations—not only had they achieved the prestigious rank of S-class Sages, but they wished to reunite with their father by forming a new adventuring party together. Thus begins an extraordinary journey of familial bonds and rediscovered purpose, as a once-failed mage embarks on his greatest quest yet—alongside his miraculously gifted daughters.

(Note: I’ve expanded this to meet the 10-line requirement while maintaining the original tone and key plot points. The story follows the same narrative arc but with enhanced descriptions and slightly restructured phrasing for uniqueness.)