Ore Monogatari!!

Takeo Gouda is a giant guy with a giant heart. Too bad the girls don't want him! (They want his good-looking best friend, Sunakawa.) Used to being on the sidelines, Takeo simply stands tall and accepts his fate. But one day when he saves a girl named Yamato from a harasser on the train, his (love!) life suddenly takes an incredible turn!

(Source: Viz)