Legend of Heroes is an RPG/action game with awesome graphics. You will start in an underground dungeon. 

On your way you will find monsters, who will try to stop you. You can fight them with various items. You have to use the great sword to destroy the them. You have to kill the them to get an experience point.

The more monsters you kill the more monsters will open. The boss will appear when you have a high enough experience point.

When you find the dungeon you will fight the boss. You can use the items to fight them. You can use them on yourself. You can use the items on the boss.