Wit's manga / #zombie(3)

In a world constantly at war and dealing with an incurable plague, Sak is a core user, meaning he has a special ability. But his power is just that he smells like plants when it's activated. When the plague infects the nearby region he is forced to leave the school to go find and save his caller, that is, the person who is attenuated to him and has something to do with his power manifestation. But once he finds his caller, even if he is immediately drawn to and obsessed with him, there is no guarantee the feelings will be mutual...

Zombie apocalypse and slightly psychopathic judo player kills zombies with his bare hands and abandons people he deems worthless. Until he runs into a guy with a suitcase and a photographic memory. They weirdly hit it off while still bickering constantly