Akira Asai is the childhood friend of Kou and Mahiru Seki, and also lives in the same apartment complex as Kou. Akira is a disciplined student who obediently follows her school duties. She is friendly and maintains a close relationship with Kou and Mahiru. Her suspicion of vampires is strong and so she doesn't really want to have much to do with them. She is seemingly very attached to Kou and often lets him get her into trouble.