Toru lives in a small Tokyo apartment with his girlfriend Saya, a budding singer-songwriter who dreams of making her debut in the recording industry with her group. She confides to him that she is in contact with a producer who would like to offer her a contract while excluding the other members of the complex from the agreement. She is convinced that her boyfriend still works as a receptionist at the Grand Pacific, a five-star luxury hotel, but in reality he has been fired and is now the head of a modest love hotel in Shinjuku, the Atlas Hotel.
At the hotel, Satomi works as a cleaning lady, who secretly cohabits with her partner, Yasuo. The two must escape the police for another forty-eight hours so that the crime committed by the man in the past, an assault against her ex-husband, falls into statute of limitations. Meanwhile, a film company has rented a hotel room for two hours, with the intention of making a porn movie there; Toru thus discovers that his sister Miyu has become an AV idol, driven by the need for money after her parents lost the family fish shop in Shiogama after the 2011 tsunami. In the late afternoon another couple goes to the hotel: Hinako, a teenager with family problems who ran away from home, and Masaya, a petty thief who pretends to be a talent scout in an attempt to circumvent her and get her into prostitution. After getting to know her better, however, he repents and decides to give up his original plan, drawing the wrath of his boss upon himself.
Meanwhile, Heya, a South Korean whose residence permit has expired and has decided to return home, faces the last day at Juicy Fruits, an agency for which she works as an escort. Her boyfriend, Chong-su, convinced that she is a simple stewardess, has instead opted to stay in Japan and their relationship seems to have reached a crossroads. Heya goes to the hotel where she meets one of her regulars, the shy and passionate salaryman Amemiya, who, at the end of their last night together, declares himself to her. Chong-su, however, having learned of Heya's true profession, books a meeting with her during which he confesses that he too had to prostitute himself in order to make ends meet. The two reconcile and decide to leave Japan and both return to Korea.
The hotel is also the scene of the affair between detective Rikako and her colleague Shinjo, but when the former recognizes in the cleaning lady the author of one of her unsolved cases, she decides to jeopardize the careers of both in an attempt to arrest her. . Satomi, however, manages to keep away from her until the crime is extinguished and reunited with Yasuo.
Amid Toru's disbelief, Saya also arrives at the hotel in the company of Takenaka, a record producer in charge of Planet Music, to whom he is granted with the promise of a contract for the recording of a record. The story, added to the rest of the situation, strongly proves Toru who, exasperated and convinced that he deserves something more from life, decides to leave his job at the Hotel Atlas and return to Shiogama, despite Saya's attempts to rebuild their relationship. now compromised.