Boku dake Yomeru Kinsho Majutsu

Tamura, a plain and unglamorous announcer, has only one redeeming quality: he absolutely never stumbles over his scripts. Suddenly, he finds himself reincarnated into another world in the body of Phil, a boy with zero magic power. No overpowered abilities, no cheat skills—it seemed like another incredibly plain life was about to begin.. until Tamura encounters a certain Forbidden Book. Written inside is Incantation Magic, a forbidden art where biting your tongue costs you your life. Extremely long texts with a strict time limit—even this magic, deemed impossible to cast and branded taboo, can actually be chanted by Tamura, who absolutely never stumbles over a script..!? Bite your tongue and your life is over!! An unprecedented incantation magic fantasy now begins!! (Source: Coamix, translated)