Unable to handle her huge debts, office worker Ki Myo Hee decides to commit suicide by jumping off the roof of a commercial building. Just then, a Grim Reaper appears in front of her and tells her to try living for 100 more days?!

When she opens her eyes, she finds out that the life she has regained is not of a human's but that of a cat's?

Fukatsu Michitaka, a boy who just became a high school student, can't differentiate people at all because of his prosopagnosia (Face blindness). However one day he runs into a girl whose face looks completely different than the rest. So in order to cure his illness and accomplish his dream of becoming "normal," he starts to get close to her.