Other than a release of outtakes/unreleased songs..a book called maybe Ayuntholoy or Ayu Bible. Every song, PV, album, tour, etc would have it's own entry/page with facts, notes by Ayu, dates, scans of lyrics from old notebooks, costume sketches, etc. Also included would be liner notes for every album taken from Ayu's perspective in 2018, maybe something interesting like...essays from peers/directors/photographers/Max/etc, full pages of outtakes from photoshoots, etc. Basically it would probably cost $120 and be A4 500 pages but would be a must have for Ayu fans for sure