Tämä kirja jatkaa siitä, mihin Kingdom Hearts Final Mix 3 jäi. Sora tovereineen etsii Rikua sekä kuningas Mikkiä, jotka jäivät pimeyden oven taakse. Matkalla vastaan tulee outo kaapumies, joka johtaa joukon salaperäiseen linnaan. Siitä alkaa uusi seikkailu, joka johtaa ystävämme jälleen Disney-maailmasta toiseen...

The sequel to the bestselling Kingdom Hearts manga series! Sora, Donald, and Goofy continue their quest to rescue King Mickey and young Riku. But will they find them in time? And who is the strange Kairi look-alike that Sora sees in his vision? Could she be somehow connected to the shadowy "Organization"...or is she another lost soul in need of rescue? It's all inside this thrilling conclusion to Kingdom Hearts Chain of Memories!

The ultra-popular worlds of Disney and Final Fantasy collide once again in this sequel to thefirst Kingdom Hearts series! Sora, Donald, and Goofy seek King Mickey and Riku, from whom they were separated when closing and locking the door to Kingdom Hearts. In search of their friends, the group unexpectedly finds itself at Castle Oblivion, where memories are freely manufactured, manipulated, and even deleted! Can Sora and his companions defeat the castle's mastermind before they forget the reason for their journey in the first place?!