After a nonprofit worker witnesses a drunk woman pass out in Shinjuku, she calls for an ambulance and accompanies her to a back-alley clinic.
Toru has an epiphany and asks to take part in Not Alone activities. At St. Magokoro Hospital, Yoko treats a girl who has overdosed on painkillers.
St. Magokoro changes its weekly schedule after Shiraki raises concerns. Keizo and Toru seize the chance and begin running a beauty clinic on Mondays.
After being saved from her assailant, Yoko explains why she was attacked. Later, she unexpectedly reunites with her mother — much to Toru's surprise.
Mayu's mother's boyfriend comes to St. Magokoro in search of Mayu. The director tells the others he's thinking of having Yoko take over the hospital.
Toru is shocked to learn of Yoko's parentage. Later, while wandering around Kabukicho at night, he spots Keizo and Mai exiting a hotel.
Yoko attempts to save the life of an unconscious elderly man. Yokoyama tells his colleagues the surprising truth he discovered about Horii.
Shiraki is furious when she realizes her husband may be visiting a shady establishment. A girl comes to Not Alone to get help dealing with a stalker.
Awaking in a love hotel, Okamoto sees Mai's apron and panics. Later, Mai brings an American TV crew to St. Magokoro to film the staff at work.
A nightclub host returns from overseas with a viral infection, leading to an outbreak of a new disease that soon becomes known as the Kabukicho virus.
Amid the ongoing pandemic, Not Alone disbands and Mai disappears. Yoko and the others spring into action when the floor at a nightclub collapses.
