Destiny's Embrace

Kairi's Keyblade was given to her by Riku in The World That Never Was in Kingdom Hearts II. Kairi's Keyblade is delicate looking, and sports a floral design. Kairi used this Keyblade to fight against the Heartless for one cutscene battle in The World That Never Was. Where it originally came from, how Riku got it and how Kairi is able to wield it are all unknown. Its keychain is a Paopu fruit, similar to her charm on Oathkeeper. The Paopu is used several times to indicate the bond between her and Sora. It's also known as a Broken Promise (the promise that Sora made to Kairi in the original Kingdom Hearts).

However after she fights once with it in The World That Never Was, Kairi's Keyblade is never seen again. It is unknown if it will reappear in any future installments of the series.

Trivia

 * The keychain at the end of the keyblade looks extremely similar to what Naminé transformed the Oathkeeper's keychain into in Castle Oblivion