Oni III - Kuro no Hakaishin (1993, Game Boy)

Oni III - Kuro no Hakaishin ("Dark God of Destruction", 黒の破壊神) is a JRPG developed by Pandora Box and released by Banpresto. It came out only in Japan.

The game is set in feudal Japan, with enemies being all kinds of creatures and ghostly being from Japanese mythology. It features the common top-down view, with a (mostly) first person view during the turn-based combats.

The story starts with a young protagonist who is living with his grandfather. The grandfather is eagerly protecting a warehouse stuffed with things from being opened. Naturally, all kinds rumour is spreading what mystical things the warehouse might contain. One day, an unknown woman comes to the grandfather's shop and insists on taking a look at the contents of the warehouse. When the grandfather refuses, she mortally wounds him and disappears. The dying grandfather leaves you the key to the warehouse and begs you to protect it from being entered. However, some relative later convinces you to let him inside, and he promptly knocks you out and steals all the stuff. Unfortunately, this brought something evil upon the world.