Ok, so, there was this anime about some guys who where able to become mechas themselves, and I remember the MC was this guy who was able to shift into a red mecha and his weapon was some kind of spear. With him was this blonde girl (lover or sister, sister most likely) who could turn into a pink mecha. And there also were some other guys who had this same power, but they were the bad guys, only these first two were good.
Those two fought against the others, and I clearly remember the girl died at the end of the series.
I also remember this sequence in which the MC was found lost in space by some spaceship but then the spaceship was attacked and the guy wanted to go out, and when spaceship's crew didn't let him, he just went into the aequilibrium chamber, transformed and went outside smashing a wall.
Anyone can help?