After quitting his job due to a power-harassing boss that took a toll on his spirit and health, Momose starts a new sales job at an advertising agency.
While creating an advertisement for a renovated amusement park, Momose and Shirosaki engage in on-site research but their journey home takes an unexpected turn when a power outage leaves them in a pitch-black train car.
Kinjo, inspired by a positive interaction between Momose and Shirosaki, changes jobs to join them at the same company, where Aoyama becomes his trainer.
Momose and Shirosaki enjoy a hot spring inn on a business trip, while Aoyama and Kinjo, returning from a one-day trip to Kumatte Land, get caught in heavy rain.
After Momose changes his phone, he receives an unexpected call from his ex-boss Kurono. Concerned Shirosaki accompanies Momose home, sharing a heartfelt story that empowers Momose to confront his past.
