What is the name of this anime?

Linebarrels of Iron

Kouichi Hayase was involved in an accident and falls into a coma for half a year. Due to this accident he becomes depressed and lonely. However, unbeknownst to him he attained a great power and three years later a giant robot (Linebarrel), which was the cause for the incident, appears before him, causing Kouichi`s life to change.

http://www.animefreak.tv/watch/linebarrels-iron-en...

The part about getting crushed by the mecha sounds like Kuragane No Linebarrelshttp://myanimelist.net/anime/3653/Kurogane_no_Line...

"Fourteen-year-old Kouichi Hayase’s life has always been a mediocre one, if not dismal. However, those days of being bullied by classmates and escaping to a fantasy of being a hero are put to an end when a certain “accident” bestows on him a girl and a gigantic humanoid robot called “LINEBARREL”. The extraordinary power that Kouichi obtains puts him and everything around him on a sudden rollercoaster ride of battles, intrigues and friendship! During the course of his adventure, the boy starts to learn what life has to offer; he meets new friends, bids farewell to the old ones, but most of all he now has considerable responsibilities and is forced to confront the world around him."

(Kurogane no Rainbareru) Linebarrels of Iron