Futsuu ni Naritai

Futsuu ni Naritai summary:

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.