This cassette was included in the game box as seen there, price as advertised:
https://pbs.twimg.com/media/Cc8uHzdUkAECQbH.jpg
Better pic of what was included in the box:
https://im3-a.mbokimg.dena.ne.jp/1/7...67978029.1.jpg
Poppins is a very big romanization mistake from this game company but I keep it as variation as it is written like that on the cassette.
ポピンズ has always been romanized "Popins" as seen on their releases, for example:
https://images-na.ssl-images-amazon....L._SL1419_.jpg
https://img07.shop-pro.jp/PA01027/66...20170518153723
http://img15.shop-pro.jp/PA01154/377...20170324193225
http://para-domestic.ocnk.net/data/p...115_1c2b5a.JPG
Artist page has been modified to Popins.