Jane was a vampire that Ai befriend during the ten year Christmas skip in the first year. Even though they forgot why they'd become friends after it ended, they remained in contact and actually did become friends.

Jane was a person full of hatred and rage and also had a tragic past that Ai could relate to. Soon, she, Jane and Saki had formed into a little group of friends. Ai still had Saki around when Jane was droned so the loss wasn't as horrible as when she lost Saki. However Ai still misses her friend a great deal.

Ai dressed up as a vampire for Halloween because of Jane. This is probably why her costume included sparkles.