Four years before Silent Parade (2022), Yukawa and Kusanagi investigate the murder of a writer after a video found in his possession piques Yukawa's interest.

Suzume is a girl born to a family running a small restaurant in Gifu Prefecture. She loses her hearing in one ear from a disease. Encouraged by her loving parents and childhood friend, she lives through an eventful life with a tenacious spirit.

Soon after the break of the pandemic and realizing that his clock is ticking, Kristofer gets the urge to embark on a journey to try to find out what really happened when his Japanese girlfriend mysteriously vanished without a trace from London fifty years earlier.

In 2020, the world is forced into lockdown by the COVID pandemic. As remote work is popularized in order to keep the infection rate under control, a young man employed by a company in Tokyo moves to a country town on the Sanriku Coast in Miyagi Prefecture, where he could enjoy fishing, in search of a new lifestyle. But gradually, we found that there were problems such as "empty houses" in the local area.

Aoi Minase is in her 40's. She works as a popular writer of romance novels. She is also a single mother, who raised her daughter alone. Her daughter is now 20-years-old. Due to Aoi Minase's success as a romance novelist, Aoi lives with her daughter in an upscale high-rise apartment building. Aoi is worried about her daughter. Her daughter doesn't have a boyfriend. Aoi Minase believes this is because her daughter is an otaku, who enjoys manga and cosplay. Her daughter does want to fall in love.

Kageyama (Sho Sakurai) works as the butler for rich heiress Reiko Hosho (Keiko Kitagawa). Reiko happens to be a novice detective but lacks certain deductive skills needed by detectives. Because of this Reiko relies on Kageyamaa to help her solve cases. Meanwhile, Kageyama isn't afraid to mince words and often calls out Reiko with his sharp tongue!