Once he learns that she's been kidnapped, he seeks her out too. In Kingdom Hearts II, Sora searches for Riku and King Mickey but he still thinks of Kairi, even fantasizing about dancing with her in Halloween Town. While she can't remember his name, she does remember that there was another boy that she played with, and she writes him a letter that she releases into the sea. However, upon learning the truth, Sora chooses to sleep for a year so he can have his memory restored and as of Kingdom Hearts II, it seems that unlike Selphie (and presumably the other islanders), Kairi has not forgotten Sora completely. In Chain of Memories, Naminé's interference erases or changes most of Sora's memories, including those of Kairi and in turn, most of Sora's friends forget about him. Be sure to bring it back to me.' Kairi once again expresses her faith that Sora will return to her in the game's ending, and after they're separated Kairi is seen looking over their cave drawings and out at the sea, missing Sora. Sora then takes Kairi to Traverse Town and after Sora refuses to let her fight with him in the final battle against Ansem, Kairi gives him a traditional Wayfinder charm, stating 'It's my lucky charm. She's able to recognize him in his Heartless form and her powers as a Princess of Heart restore him to human form when she hugs him. He fights Ansem, Seeker of Darkness (who is possessing Riku at the time) to protect her and stabs himself with a keyblade to release her heart, turning himself into a Heartless. Upon finding her body with Riku in Neverland, Sora tries to save her and later chases them to Hollow Bastion in an attempt to recover her. Kairi's heart rests inside Sora's while he goes on his adventure to find her. In Kingdom Hearts I, they are shown playing and talking together before their home falls to darkness. According to local legend if two people share a paopu fruit 'their destinies become intertwined'. They become close friend and perhaps even have childhood crushes on each other, as evidenced by the drawings they made in the Secret Place that depict them exchanging paopu fruits with each other. Sora and Kairi first meet as young children sometime between Birth by Sleep and Kingdom Hearts I. Throughout the series, his primary motivation is reuniting with his childhood friends, Riku and Kairi, although he often ends up helping those he meets on his travels along the way While he's meant to be an ordinary boy, circumstances beyond his control force him to wield the Kingdom Key keyblade and traverse the worlds. He's an adventurous, optimistic, and friendly teenage boy hailing from the Destiny Islands. Sora is the protagonist of the Kingdom Hearts series. She is determined, loyal, and thoughtful. Like Sora, she is driven by finding her friends, especially after they leave her behind. She is the childhood friend of Sora and Riku, the latter of whom she receives a keyblade from. Her past is mysterious due to her amnesia, though her being a Princess of Heart has effected her life from an early age and made her the victim of apprentice Xehanort's curiosity. She lives on the Destiny Islands but her early childhood was spent in Radiant Garden before the fall. Kairi is a Princess of Heart, a young lady with a heart of pure light and a great potential for magic.

It has enjoyed popularity in the fandom due to its early existence and its large amount of canon content/support. The ship originated in Kingdom Hearts I with the introduction of both characters involved. In Japanese it's called 空海 from the kanji for sky (sora) and sea (kai). Kairi x Sora or Sokai is the ship between Sora (ソラ) and Kairi (カイリ).

Sora kingdom hearts 3