Due to an incident from his past, Higurashi Tabito lost his hearing, sense of smell, taste and touch. He only has his sense of sight left. Nevertheless, Tabito is a private detective who finds lost things using his sense of sight. He lives at a private detective office with his partner Yukiji Masahiko and daughter Momoshiro Tei who is not blood-related to Tabito. Yamakawa Yoko is a nursing teacher. She meets Tabito and Masahiko through Tei. Yoko asks Tabito to find a lost article which is important to her. Since then, Yoko visits Tabito’s office often. While trying to solve Yoko's case, Tabito's eyes become exhausted. His partner Masahiko becomes worried over Tabito's condition. One day, Tei goes missing. To find his daughter, Tabito uses his eyes, but his doctor tells Tabito “if you keep doing this, you will go blind.”