Kairi's body vanished when Destiny Island was overwhelmed by the darkness, while her heart found a temporary refuge within Sora.
During the climactic night when Destiny Island was being consumed by the Heartless, Kairi's fate became intrinsically linked with Sora's. As the darkness encroached, she was drawn towards Sora, who was trying to close the Door to Darkness.
The Events Unfold
The destruction of Destiny Island was a pivotal moment, marking the beginning of Sora's grand journey. For Kairi, this event resulted in a unique phenomenon:
- Island's Consumption: The island, along with its inhabitants, was assaulted and swallowed by an overwhelming surge of Heartless and the encroaching darkness.
- Kairi's Disappearance: Amidst the chaos, Kairi's physical body inexplicably vanished. This was not a simple abduction, but a deeper, more mystical consequence of the darkness.
- Heart's Refuge: It is understood that as Kairi's body disappeared, her heart, seeking protection, passed through Sora. In that moment, her heart chose Sora as a vessel and was left behind within him, while her physical form was transported to a distant, unknown world.
This profound event meant that for a significant period, Kairi's heart resided within Sora's, unbeknownst to him, becoming a critical part of his quest to restore her and other lost hearts. Her body, devoid of its heart, ended up in Traverse Town, in a catatonic state, until Sora's actions later in his journey would facilitate its reunion with her heart.