笹山 裕二

Senior officer of the Shibuya Precinct's Criminal Affairs Division, five years older than Kano.

Known as the "Cosplay Detective" due to the strange outfits he wears while on stakeouts. He's partnered with Shinya Kano for the kidnapping investigation.

It's quite rare for Sasayama to actually wear a suit. On the rare occasions when he does, and he's walking the halls of his home precinct, he frequently goes unrecognized.