When Organization XIII discovers that in an unknown world hearts are being released by a force outside the Keyblade, Roxas is sent to find out what sort of weapon might have such effect. Thanks to the inhabitants of this strange place, what began as an everyday mission will make everything Roxas believed in with absolute faith crumble forever.

Cuando la Organización XIII descubre que en un mundo ignoto los corazones están siendo liberados por una fuerza ajena a la Llave Espada, Roxas es enviado a averiguar qué clase de arma puede tener semejante efecto. Así, gracias a los habitantes de este extraño lugar, lo que comenzó como una misión rutinaria hará que todo en lo que Roxas creía con fe ciega se desmorone para siempre.

Hiroto had a nightmare, somehow it felt strange...the next day, a new girl came to the class. Hiroto thought she was his childhood friend, Kairi. But it all changed when Kairi seemed to lost her memories of him. And with the darkness coming up, it's on!