The designation signifies a specific volume within a larger curated series. Volume releases during this era typically served one of three purposes:
The "CPSKY" catalog prefix is synonymous with high-quality image DVDs from that era. What makes Volume 55 special is its inclusion of , giving fans a deeper look at Natsumi's early career sessions that weren't included in her standard standalone releases. Artist: Natsumi Momose Series: U15 Junior Idol Best Selection Vol. 2 Catalog Number: CPSKY-055 Original Price: ¥4,180 Rarity and Market Value -DVD- CPSKY 055 Vol
Physical media preservationists closely track these specific volumes because many were never digitized or ported to high-definition formats. The designation signifies a specific volume within a