C'est Se Bonne, Shaking Loving Heart

Nakajima rescues a cat and the gang wants to celebrate. He gets drunk and calls Miyuki who’s running late, to propose and ends up telling her he needs more space from her. Whooops! In the meantime, there’s an assignment where Nakajima and Miyuki are forced to couple up undercover to unravel a food cart related car stereo/equipment theft.

Synopsis excerpt via Kitsu.