During a chaotic school trip, Yogiri Takatou wakes up to a world in disarray where his entire class has been transported. Despite sleeping through the upheaval, he discovers his peers have been gifted with powers by a mysterious Sage, leaving him behind. Abandoned and facing a dragon, Yogiri must protect a fellow classmate using his unique ability to invoke Instant Death. The only challenge? Staying awake to unleash his formidable power.