The first 10 reams are free! A new limited edition "Seiso" will appear in "Midnight Party" from 5/18

The first 10 reams are free! A new limited edition "Seiso" will appear in "Midnight Party" from 5/18
Introducing the new limited edition character "Hoshi Frost" of "Monster Strike" "Midnight Party"....

The linked article is in Japanese.