epilogue

there is something gnawing at me inside because i know i have heard this before. and it was something i kept listening to in the past. but i never knew it as 'epilogue from fruits basket'. it's a terrible feeling, not being able to recall where/how i know the piece. is memory loss like that? 难道 i just have to let it be and not remember where it is from??? looking at my Wants list, i think i've got one out of the four so far.