Sono Munou, Jitsu wa Sekai Saikyou no Mahoutsukai: Munou to Sagesumare, Kizoku-ke kara Oidasareta ga, Gift "Tenseisha" ga Kakusei shite Zense no Nouryoku ga Yomigaetta Chapter 45
That Incompetent Is Actually the World's Strongest Wizard Chapter 45
There might be spoilers in the comment section, so don't read the comments before reading the chapter.
Sono Munou, Jitsu wa Sekai Saikyou no Mahoutsukai: Munou to Sagesumare, Kizoku-ke kara Oidasareta ga, Gift "Tenseisha" ga Kakusei shite Zense no Nouryoku ga Yomigaetta Chapters