Souta Hatate

A transfer student who has the ability to see the fates of people in the form of flags atop their heads, and thus can "break" (change the fate of) them with his actions.

Prior to the start of the series, he is a sole survivor from a sinking cruise ship Premium Anberial; during the cruise he acquires his precognitive abilities from a girl named Sakura who plays a chess-like game with him.

He becomes a loner but eventually opens up to his classmates. He lives in the Quest Dorm with many beautiful girls.

Episode 12 reveals that he is Nanami's younger brother.
(Source: Wikipedia)