When a mysterious book falls onto Sho’s computer keyboard, it grants anyone the power to glimpse the past through the monitor. During one of these time‑travels, Chris’s dog, Ruffles, becomes trapped in the past. To rescue her, Sho’s cousin Hisashi and the detective Zenmaijikake embark on a search through time. Meanwhile, Sho and his classmate Azusa keep the computer under control and monitor the present. The older siblings struggle to keep their time‑travels a secret from Sho’s parents.