The Immortal Girl and Her Hapless Grim Reaper

A single encounter on a train turned a 17-year-old high school girl into a "dedicated problem child for the Reaper." Even if the scythe is swung down, she doesn't die for some reason and is resurrected on the spot any number of times. From that day on, the Reaper's daily life changes from elegant soul collection to a slapstick drama of chasing a high school girl who doesn't die.