Opening 1 Innocent sorrow song HD, sang by abingdon boys school that appears in D.Gray-man episode 1-25. It's rock song that increase interesting in opening, so try to watch it.
Anyone who interested in this anime can dive to D.Gray-man anime series for more information.
P.S. This opening 1 is great, however, I think D.Gray-man opening 2 is greater.
credit : Thanks to Alarika9 for D.Gray-man opening 1
