A year of peace after the confrontation with Master Xehanort, Hikari and the others prepare to for the possible war. Will the light prevail, or will the darkness consume everything?

After returning to the islands after a year, Sora and Riku are called to undergo the Mark of Mastery. While Sora and Riku take the exam, Hikari becomes increasingly worried as many strange incidents happen while they are gone. Will the Princess of Kingdom Hearts be able to protect those she cares for and save those she lost? Or will she lose everything?

Sora and Hikari were placed in memory pods to regain their lost memories. Over time, Riku had been fighting to trap the darkness in him and seal it away. After a year has gone by, DiZ discovers horrifying news about the Princess's condition. Will Hikari wake or remain asleep? And if she wakes, will she find the one she loves?

Hikari washed ashore on the islands at the age of 6, along with another girl named Kairi. Kairi is adopted by the mayor while Hikari is taken in by Riku's family. Over the next several years, she becomes close with Sora, Riku and Kairi. After the islands are destroyed, the 4 are scattered. During this journey she will discover who she is. But what will be the price?