The shape shifting ring is a ring that was given to Kimihiro Watanuki from the Jorougumo as payment for giving her The Crimson Pearl. The ring is a magical item that changes its shape when a person puts it on. The ring takes the shape of a person's spiritual energy. After being given to Watanuki, he passes it onto Shizuka Doumeki. Shizuka first takes it and tries to put it on his right ring finger. An annoyed Watanuki instructs Shizuka to put it on his left index finger instead. Shizuka complains, as it did not fit his ring finger, but to his surprise, it fits perfectly.