Iron Knight

Iron Knight is a manga written and illustrated by Yagi Tomohiro. It was serialized in Weekly Shōnen Jump from December 2, 2013 to March 31, 2014.

Plot
The story of Iron Knight revolves around the life of Ushizume Teppei. Teppei is a normal boy that lives a normal life. He goes to school, and has friends like every other 10-year-old boy. Although he doesn't live with his parents, because his mother died and his father has to be away from home for long periods of time because of his job, he stays with Himegami Tsubasa, a very close friend of his, and her family until his father returns. But everything changed when one-day Goblins decided to rampage and attempt to destroy the world. Teppei discovers he's a Goblin too, but he decides to use his newly found power to fight against other goblins. He vowed to fight until he can save the city.