My Instant Death Ability Is Overpowered

On a school trip, a bus carrying students is abruptly pulled into another world by a sage named Sion. She grants most of the students special abilities called "Gifts," hoping to enlist them as future sages. But a handful are left without powers, and the others abandon them. Yogiri Takatou, one of the students without a Gift, wakes up to a dragon attacking the bus. In the confusion, he kills it effortlessly with his natural power-the ability to end any life instantly. Teaming up with another survivor, Tomochika Dannoura, Takatou begins searching for a way home. Along the way, he won’t hesitate to kill those who threaten or underestimate him, even his former classmates.