Getting his revolver back

In a brief moment where Chiharu crashes a bus to intervene betweeen Jigen and Adele's paramilitaries, she tells him that he needs to help Oto move forward since she lost her mom. To do "that", Chiharu hands Jigen back his Model 19. She calls it his key. He agrees (sarcastically).

Example of:
Action Film, Quiet Drama Scene