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

A story about the journey of a master and his apprentice. The master, Valen, was once hailed as the "Strongest Mage," but a certain incident cost him his beloved mentor, his eyesight, and all his magical power. Now, he is an oblivious mage who is awkward around women and can only unleash his former power for a mere ten seconds. His apprentice is Ria, a prodigy with immense magical talent who practically forced her way into becoming his student. However, she is determined to keep her identity as a woman a secret at all costs. A fantasy adventure tale featuring the former "Strongest Mage" who can only fight for ten seconds and a cross-dressing girl harboring a certain secret. (Source: MANGA MILLION)