After the starting plot,as you take control of Juste, walk forward until you see a pile of scrap something, jump over it and suddenly the thing rise as a giant golem to chase you. Don't worry, just walk over the drawbridge and the bridge will rise, leaving the golem fell under the gap. Walk in the door of the castle. Remember to press select so you can see the map and so you will have an idea where you're going.
Inside the castle, you can try to hit the torches and some other "breakable" things, they will drop stuff like gold, subweapons or hearts (supply for special move cost). Walk forward to a platform, hit the pillar to collapse it so you can continue. You will notice two bookcases which have an opening for you to jump up.
Going up the first bookcase, pick up a leather armor, equip it and continue through the path forward. Look for an opening and jump up, beat a few simple monsters and repeat doing so until you reached the top floor, turn left and you reached your first save point.
Following the save point (SP for short from here on), there's a platform step up and a path forward. Jump up first, there's a Heart Max (fills your heart supply to maximum according to your current level), the area beyond require a higher level of jump skill (Relic) so head back and go forward the previous floor's path. A red door shows the way to Corridor of Marble. Proceed if you want.
You can also turn back from here to the second bookcase at the entrance corridor, jump up to pick up a leather boot. Follow to the next room to pick up the first relic. "Soul Crystal Ball", allows you to see damage you caused to the enemy. Go back down and forward the corridor to a red door leading to Heretic Grave which currently inaccessible because of a stone wall block. Going back the corridor, there is a gap to jump down, which has a Life Max in there, a yellow stone wall blocks this way down. This leaves you no other choice but to go back to the Corridor of Marble.
Following the corridor into a room, plot occurs where you first met Death in this game, he's not around here to fight you now. Continue forward and you will see a bigger room with many stairs. Pick up a piece of map (castle map 1) in the middle of the room. This will automatically add a part of the castle (displayed in shadow) on your map screen.
Toward upper left, you entered a corridor which is too high for you to jump upwards. Jump to the platform in the middle,and push down the box to help you go up. At the end of this area, you find an Ice Spellbook and a Heart Max.
Back to the previous chamber, there's a gap going down lead to a new section, Room of Illusions. Go to the upper right for the moment. Follow the path to the first Boss room (Boss room is marked by a flashing blue door which will open as you approach). Before that, go to the step platform up and find SP2. You can continue to explore a bit and gain exp then go back to challenge the boss when you are ready. You can find a Red Holy Stone, with fire enchant to the whip you use. Also note that there are several items placed in relatively speaking inaccessible spots; you have to come back later to get them. Some points are also blocked by a locked door which you can't go forward until you find the keys. Pick relic "Book of Faeries" to show enemies' names when you encounter them. And find the red door to "The Approach of Deprice". That's about time to go back and face the Boss, don't forget to save before walk into the Boss room.
A Giant Bat
Relatively speaking an easy one, his attacks are: shoot small fireballs, scroll himself like a drill and attack from above. Easy to dodge, shouldn't be too challenging.