Frustrated with her thankless office job, Retsuko the red panda copes with her daily struggles by belting out death metal karaoke after work.

After catastrophic earthquakes devastate Japan, one family's resolve is tested on a journey of survival through the sinking archipelago.

It is a cross over between the series Lupin III and Case Closed and takes place after the television special Lupin the 3rd vs Detective Conan, additionally incorporating various elements from its predecessor in its plot. The plot follows Conan Edogawa who sets out to apprehend Arsene Lupin III, the suspect of stealing a jewel called Cherry Sapphire.