The Court Wizard in the Shadows
影の宮廷魔術師～無能だと思われていた男、実は最強の軍師だった～
Kage no Kyuutei Majutsushi ~Munou da to Omowareteita Otoko, Jitsu wa Saikyou no Gunshi Datta~, Shadow Court Magician: The Man Who Was Thought to Be Incompetent Was Actually the Strongest Tactician, 影之宫廷魔术师~本以为无能的男人、其实是最强军师, Волшебник Теневого Дворца
Description
Leon is the kingdom's most worthless Court Magician. One day, his repeated absences are punished and he is sent to the battlefield, but with the quick wits he was hiding he saved the Third Princess Sicily? Then, along with the reformer princess, and steeling his own resolve, Leon becomes a specialized officer determined to control events from the shadows.