: Mami investigates Kazuya’s workplace and encounters Chizuru on a train. She notices Chizuru carrying a bag she previously saw at Kazuya’s apartment, leading her to suspect their relationship is closer than just a rental arrangement.

The story focuses on the aftermath of a drinking session where Kazuya struggles with a severe hangover and fragmented memories.

For the file , please note that Season 1 of the anime only consists of 12 episodes. The file likely refers to Season 2, Episode 7 (which is Episode 19 of the overall series), titled " Birthday and Girlfriend " . Episode 19 Synopsis: " Birthday and Girlfriend "

: As Ruka’s birthday approaches, she demands to spend the day with Kazuya. Meanwhile, Kazuya learns that Chizuru's birthday has already passed and feels guilty for not celebrating it.