Lyric discussion by reelhappy 

Atsushi Sakurai's Mother Died - This Is One Of His Songs, Coping With Her Loss... He Felt Like He Lost His Angel.... Dress Is Most Likely The Symbol Of His Mourning.... He Wore A Lot Of Black Back Then.... Through His Grief He Found Strength Again & Continued Living As An Artist To Keep His Mother's Spirit Here With Him.... One Of His Concerts He Made This A Tribute To Her... I LOVE THIS SONG.

The song's about the choice he made to let her go. Perhaps he thought that she would wait until he gathered enough courage, and perhaps he finally realized that with each passing day she lost faith in him until she just wanted him to close the door on the past. It's a wonderful song. The wind has erased it and now the little that remains is resentment.

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