Tickets to a recital by "deaf pianist" Takashi Nanao arrive at the Kanbara Locum Doctor Agency. Akira Kanbara is suspicious because there is no sender on the envelope. But he invites Michiko Daimon anyhow. He then finds out that Nanao's assistant, Yuka Nanase, sent the tickets. She has been researching treatment methods because she believes Nanao's music can only get better if his hearing returns.
