Shun is a police detective who lost his old partner, Yuto, in a firefight a few years back. Since then he’s been moody, angry, and impossible to work with, and he’s very close to losing his job entirely as he tries to drown his grief by trying to track down Yuto’s killer. In an attempt to get him back on his feet, commissioner Reiji sets him up with a new partner: a fresh-faced, excitable recent police graduate named Yuya. Buddy cop shenanigans ensue, but after a close call, Yuya learns about Yuto, and surprises Shun by agreeing immediately to help him look for the killer, despite it being off the books and potentially could lose both of them their jobs at best and their lives at worst.