Kingdom Hearts: Chain of Memories

Sora is a young energetic boy looking forward to exploring the world with his friends, Riku and Kairi. The threesome is working hard on completing a raft that will allow them to leave their island but one day a mysterious force causes Sora to gain a special weapon known as the Keyblade. He fights some weird monsters and gets transported to a strange town. Meanwhile, Donald and Goofy leave their castle to search for the king and the chosen one who holds the "key" to saving the world. Sora is attacked again by creatures known as Heartless but is helped out by an old man named Cid and a warrior named Leon. He eventually meets up with Donald and Goofy and they join forces to go search for his friends and the King.

Kingdom Hearts II follows Sora, Donald and Goofy on their continuing quest. It has been one year since the events of Kingdom Hearts. The story begins in Twilight Town, a quite burg nestled between night and day. Sora and friends are joined by a vibrant new cast of characters, including King Mickey himself! Together, they will encounter countless dangers in worlds both familiar and brand new. (Source: Amazon)

The door to Kingdom Hearts was sealed, dealing a blow to the heartless and restoring the worlds to normal, but Riku and King Mickey were trapped inside! Now Sora, Donald, and Goofy's search for their friends leads them to the mysterious Castle Oblivion, where a hooded figure tells them, "Ahead lies something you need, but to claim it, you must lose something dear." What could be more dear than their very memories themselves? And what do the shadowy members of Organization XIII want with them? (Source: TOKYOPOP)

Roxas is the protagonist of this story. Number XIII of the Organisation. He has no memories of the time before he became an Organisation member, and so as he performs missions every day, he has doubts and questions about everything around him. He is able to wield the keyblade.