This is the product SKU or serial number. In the world of Japanese media, these codes are essential for identifying the exact publisher and volume number.
(often associated with the name Gang Ben Tao Jia in various localized translations or character-set conversions) is a name that frequently appears in these catalog listings. icdv 31103 momoka okamoto gang ben tao jia sweet idol f new
For the uninitiated, the keyword string can be broken down as follows: This is the product SKU or serial number