The Last Man

Overview

Ai Omori finds a naked and unconscious boy on a sidewalk and decides to bring him to her home. She gives him a name: Makoto. Makoto isn't able to eat or walk, and doesn't speak a language: practically like a baby. But he starts learning immediately what people do and soon, shows an incredible strength. He acts instinctively and becomes uncontrollable.

Source: AniList