I always can't remember the name of this song, and I've been searching for it for hours at this point. It has piano and some drums in the original music video, and the video depicts the singer at the center of the screen with his foot chained.
The lyrics depicts the singer growing up and saying that he is perfect just so he won't get hurt. But as time goes on, the weight of exceptions slowly started to hurt him. The last line translates to something like "When I saw the world for the first time, I saw you." followed by a shot of high school girl who in my interpretation "saved" him, which is significant since the other people expect the main singer are depicted as "sketchy stick figures". The video ends with the chains broken.
I don't know the original male singer, but there was a cover (sung by Kyo I think)
Just to help you guys in finding the song, I think it starts with "Boku wa tadashii nante" or something like that, which supposed to be part of the first verse that loosely translates to "I always do everything perfectly" Or something like that.