It's Maxi-single, not Mini-album https://www22.big.or.jp/~yunisan/vi/arcturus.html

Your source isn't often the best. They put sometimes Single instead of Mini Album. Please find an other source to be sure.

I changed it to Single because the Band stated it as Single themselves in the release flyer wich was uploaded here already ;)

The elusive four-track single... :P

Added an HQ cover.

Very nice of you!