Twenty-five years after a college student vanishes—leaving only the first joint of her finger behind—the case remains unsolved. Her twin brother, now a local police officer, is forced to team up with a transferred elite cop he doesn’t get along with. When a call leads them to search for a missing elderly man, they uncover clues that may finally unravel the long-buried truth.

The story centers on the daily life of college dorm roommates Yumi Irisu and Ruka Kujirai. Ruka, the older of the two, is constantly penniless despite her being active in a band. Irisu works part-time at a second-hand bookstore.

Hasebe Kaori is a rookie movie director. She consults with new screenwriter Kai Chihiro about her movie's screenplay. The script is based on the Sasazukacho Family Murder Case that occurred 15 years ago. That murder case involved a hikikomori man who murdered his younger sister at their home and then set their home on fire. The fire also killed his parents. The town where the murder took place is also the hometown of Kai Chihiro. Both Hasebe Kaori and Kai Chihiro have secrets related to the family murder case. While Hasebe Kaori and Kai Chihiro look into this murder case for their movie, a shocking truth is uncovered.

Nakanishi Aruno is disliked and bullied by other Nogizaka46 members because she’s different from them. After one of them lock Aruno and tell her to not come back, she decides to come back definitely.

The one-hundred-year-old Fujiya inn stands in the quiet region of Kyoto. Mikoto is standing in front of the Kibune river at the back of the building when she is called back to work. But two minutes later, she finds herself back at the river again. The whole inn seems to be stuck in a time loop!