My Instant Death Ability is Overpowered

During a routine school trip, student Yogiri Takatou makes the unfortunate mistake of falling asleep, causing him to miss an extraordinary event. While he rests, his entire class is suddenly transported to another world, where a mysterious sage grants each of his classmates unique and powerful abilities. By the time Yogiri finally wakes up, the situation has already spiraled far beyond anything normal, leaving him completely unaware of the magical gifts bestowed upon everyone else. Thrust into this unfamiliar fantasy realm with no special powers of his own, Yogiri finds himself in immediate peril alongside his classmate Tomochika Dannoura. The two are quickly confronted by a fearsome dragon, forcing them into a desperate fight for survival. With conventional options exhausted and danger closing in, Yogiri reluctantly agrees to join forces with Tomochika to defend themselves. To protect them both, he must rely on a singular, devastating power: his Instant Death ability. This overwhelming skill may be their only hope against the threats of this strange new world. However, wielding such incredible strength comes with one persistent challenge for the perpetually drowsy teenager—he simply has to manage to keep his eyes open long enough to use it.