The filming had reached its climax.

The medical suspense film "Existence." Ritsu, a pharmaceutical company employee played by you, discovers wrongdoing within their company. They turn to their childhood friend and police officer Kei, played by Shu, exposing the company's plan to release a virus to drive up drug prices, and brilliantly thwart the conspiracy. Through the investigation, Ritsu and Kei grow closer and officially become lovers.

The scene is the climactic kiss scene. Once this is filmed, all that remains is the epilogue to wrap up the shoot. It's been a long production, but they can finally go home. That's what the staff were thinking. ...However.