ayu-mi-x II:
First pressing:
Glitter embedded in plastic of jewel case. Back tray card is transparent plastic. "obi" information printed on sticker on the front of the package. No obi.
Later pressing:
Regular plastic jewel case. Back tray card is opaque paper. "Obi" information still on sticker on the front. No obi.
ayu-mi-x III:
First pressing:
Title and colored border printed on clear plastic slipcase. Clear plastic "obi" is included as part of, but separate from, slipcase.
Second pressing: (worth noting that I very VERY rarely see ayu-mi-x III's second pressing. One photo of the front is all I have, so NSMM is used to demonstrate the other side.)
Title and colored border printed on tray insert, around photo of Ayu. "Obi" information printed on sticker that sits underneath the tracklist on the "booklet" side of the case. No obi.