Noroma Mahou to Yobareta Mahoutsukai wa Juuryoku Mahou de Musou suru

Wade, a boy born in the slums and raised by terrible parents, finds a glimmer of hope when he becomes an apprentice adventurer. Enduring grueling training, he's promised to be taught magic if he perseveres. On the day of his fateful magic instruction, while others are granted promising fire and water magic, Wade receives what seems like the worst of luck—a magic called "Slow Magic." In despair upon realizing it's a spell that makes him clumsy, Wade recalls memories of his past life as a corporate slave.