The "Portable" tag suggests this archive was distributed during the era when digital media was shifting toward handheld viewing, often provided in formats compatible with mobile devices of that time. Archival Metadata
The "Portable" tag indicates the images were cropped or resized specifically for the 16:9 or 4:3 aspect ratios common to handheld screens in 2010. from this era or more information on Noriko Kijima's filmography The "Portable" tag suggests this archive was distributed