This game is one of the best I have ever played. It keeps me coming back even years after I've beaten it.
The game begins with the previous game's protagonist, Soma Cruz, in a large city with his girlfriend, Mina Hakuba. Suddenly monsters appear and he must protect Mina. A woman (Celia Fortner) appears and tells him that her cult wants to bring about the coming of the dark lord (Dracula). She escapes and Soma takes off in pursuit. From then on, he must explore the cult's castle and stop Celia.
Now onto the gameplay. At the outset, you have only a knife and the clothes on your back. In addition, you have 3 monsters' souls at your disposal. In this game, similar to Aria of Sorrow, when you kill a monster, you have a small chance of capturing its soul for your use. There are 4 categories of souls: Bullet, which serve as secondary weapons, Guardian, which serve as defense and extra attacks, Enchant, which enhance your stats, and Ability, which give you powers, like a double jump.
Along with souls, there are also other weapons. These weapons fall into 6 categories: Swords, Short Swords, Katanas, Axes, Polearms (Spears), and Punches. There are also weapons that do not fall into any category, such as the 2 handguns, throwing items, and the Boss Rush weapons (Boss Rush is unlocked after beating the game with the good ending). These weapons can be upgraded at Yoko's Synthesis Shop, by fusing weapons with souls (this uses up the soul, so watch out if you're going for the 100% Soul Rate). There's also armor and accessories to equip.
The gameplay is very smooth, yet somewhat linear. You progress through the castle and fight bosses in several different areas, such as a plant area, and water area. Each boss is imaginative and unique.
The game has a lot of polish to it, such as when you use a katana, you see Soma sheath the weapon after slashing. Also, there are "super attacks" you can do with weapons, at the cost of a liitle MP. With the handguns, you can watch the shells clatter to the floor, and in the Lost Village area, you can see Soma's breath fan out in front of him.
Lastly, this game is amazing and is a good addition to any DS gamer's library. It controls flawlessly, and feels very smooth.