Kyoko Okitegami is a detective whose memory resets when she sleeps, ensuring secrecy and same-day solutions. Yakusuke Kakushidate, an unlucky man often caught up in trouble, asks her to clear his name after an SD card containing company secrets is stolen. Kyoko identifies the culprit, but is then put to sleep and forgets her entire deduction. ©NISIOISIN/ KODANSHA LTD. ©NIPPON TV

Kyoko is asked to provide an alibi for murder suspect Kujirai, who claims they had tea at the time of the crime. Unable to remember, she investigates with him. Jealous Yakusuke is instead wanted as a key person of interest! Meanwhile, at the crime scene, Kujirai quietly reaches for Kyoko's neck... ©NISIOISIN/ KODANSHA LTD. ©NIPPON TV

Kyoko repeatedly visits the museum where Yakusuke works as a guard, admiring a painting called Mother. One day she values it at 200 million yen, but later says it's worth only 2 million yen. After an old man damages the painting and Yakusuke is fired, he asks Kyoko to uncover the truth. Disguised with black hair, she investigates. ©NISIOISIN/ KODANSHA LTD. ©NIPPON TV

Kyoko and Yakusuke are hired to guard famed frame maker Wakui during his final job before retirement. When they visit his apartment building for aspiring artists, they find him stabbed and covered in blood. He survives but refuses to name his attacker. Kyoko suspects one of the 37 residents and vows to make the culprit confess. ©NISIOISIN/ KODANSHA LTD. ©NIPPON TV

Kyoko and Yakusuke are invited to mystery writer Sunaga's annual festival, where editors follow clues to find his hidden new manuscript. As a huge fan, Kyoko is thrilled. But just before the event begins at Sunaga's villa, only Yakusuke learns that Sunaga has suddenly died. Not wanting to ruin Kyoko's joy, he tries to keep the event going... ©NISIOISIN/ KODANSHA LTD. ©NIPPON TV

Working as a maintenance man at a girls' school, Yakusuke saves a student from an apparent gas suicide but is suspected of trying to kill her. With the girl unconscious, he asks Kyoko to investigate. They infiltrate the school, where he recalls seeing another girl at the scene. Was it suicide or attempted murder? ©NISIOISIN/ KODANSHA LTD. ©NIPPON TV

Kyoko and Yakusuke are asked to investigate whether mystery writer Sunaga, who recently died, may have taken his own life. Kyoko decides to read all 99 of his books and asks Yakusuke to keep her awake so she won't lose her memory. As they spend days together, they grow closer, but exhaustion takes its toll and Kyoko collapses in the shower... ©NISIOISIN/ KODANSHA LTD. ©NIPPON TV

Trusting Yakusuke, Kyoko writes "I can trust Yakusuke" on her body before sleeping, only to wake up with no memory of who he is. She is then asked to investigate a murder, with Yakusuke, who was working there part-time, as the first to find the body. As she solves the case, Kyoko also tries to discover who Yakusuke really is. ©NISIOISIN/ KODANSHA LTD. ©NIPPON TV

Worried that Kyoko is being used by someone, Yakusuke investigates Horo, believing he holds the key. Meanwhile, Kyoko is hired by company president Yuinozaka to crack a code, but senses a hidden motive behind the request. As she investigates, Yakusuke waits outside the cinema for their first date... ©NISIOISIN/ KODANSHA LTD. ©NIPPON TV

Ten days after Kyoko disappears, Yakusuke finds her with black hair, but she no longer remembers even the name Kyoko Okitegami. Sawano appears, claiming she is his wife, who vanished years ago. Not wanting to ruin her happiness, Yakusuke says goodbye. Meanwhile, Sandglass faces closure as traces of Kyoko's life as a detective vanish... ©NISIOISIN/ KODANSHA LTD. ©NIPPON TV