Genova no Deshi: 10-byou shika Tatakaenai Majutsushi, Nochi no "Maou" wo Sodateru

This is the story of a certain master and apprentice on their journey. The master, Valen, was once known as the "Strongest Mage," but after a tragic event, he lost his beloved master, his sight, and all of his magical power. Now, Valen can only use his former powers for 10 seconds at a time, and he's awkward around women. His apprentice, Ria, is a magical prodigy who forced her way into becoming Valen's apprentice, almost like a wife barging in. However, she's determined to hide the fact that sh...