Galileo Episode Zero

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.
(Source: Tokyograph)
~~ Adapted from the novel 4 from the novel series "Galileo", namely "Galileo no Kunou", by Higashino Keigo.