Nightstick

The nightstick is a collapsible, baton-like weapon carried by police officers in Tokonosu City. Rei Miyamoto acqires a nightstick along with the Smith & Wesson M37 Air Weight among two dead police officers. Asami Nakaoka later uses a similar nightstick at Taiei Shopping Town.

Overview
"I believe that in the past, collapsible nightsticks like this were made by Nobel Industries, but I do not know about these new longer ones." -Daisuke Sato