This special episode is a spin-off of Galileo series with Kusanagi's colleague Yuge Shiro as the main character about an incident referenced in the first episode 01 and how it was solved. It is set 3 years prior to the events of season 1

The special is set 3 years prior to the drama series, with the story being related to a murder case that was partly referenced in the original show. Detective Kusanagi is looking to solve a murder mystery, and he gets back in touch with his former badminton teammate, the brilliant professor Yukawa Manabu. --Tokyograph

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