Boku no Kanojo wa Dekkawaii is a Manga/Manhwa/Manhua in english language, Comedy series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

For as long as he remembers, Komi has been shorter than his fellow classmates. He always felt inferior as a result, until he met Obinata - a girl who is head and shoulders above him.
Yes, Asumi Obinata is tall. She’s imposing. But she’s also Komi’s girlfriend. And these two are the happiest kids in the world.
The super-popular oneshot has been expanded to a full series here!