Manga Like Planarian Humans

Yuu Kaneko has lived his whole life on a small, peaceful island, and he wants nothing more than to leave it behind for Tokyo and the big-city life. But one day, that peace is shattered when his fellow islanders are mysteriously infected and start to tear one another apart! Those afflicted regenerate at inhuman speeds, even growing back severed limbs, and nothing seems capable of stopping them. As the numbers swell, how are the few left unaffected going to survive…? (Source: Yen Press)