This is an expansion pack for "Dragon Slayer V - Sorcerian". To play it, you need to boot from the "Dragon Slayer V - Sorcerian" Program disk, and select the bottom left option from the menu. Now swap the disk with disk 1 from the expansion pack.
This MSX version is not titled Sorcerian Additional Scenario Vol. 2 like the other platform ports presumably because Vol. 1 was never released for MSX. Details: http://tk-nz.game.coocan.jp/sorcerian/about/game_sor2.html