Totonou Kuno (Masaki Suda) goes to visit the grave of Yoshikazu Miyoshi (Asami Mizukawa). Then, there was Haruo Tenda (Kosuke Suzuki), and he thanked him for remembering the anniversary of the death of Kiwa, who was once a partner of Tenda. Tenda invites his high school classmates and guests to a mystery party at the villa and asks them to come. Also, I talked about the arrival of Seiko Furo (Sari Ito) at my lecture, and I heard from Furo that Sei was cooperating with the police, so I showed off mystery solving skills at the mystery meeting. I want you to do it. When Sei is having trouble answering, Tenda reassures him that he is just a part-time job to help carry luggage and clean up meals. And he added that he had only one request.On the promised morning, when Sei went to the meeting place, Tenda came to pick me up by car. I was surprised to see the bath light in the car. She told her that she invited her because Furo Hikaru was enthusiastic about her studies, and she told them not to tell the people who gathered at her meeting that she was a detective.Tenda's car running in the snow arrives at a mountain lodge covered with ivy. According to Tenda, it is called 'Ivy House'. It was Takakatsu Tachibana (Kuranosuke Sasaki) who welcomed the heavens and the men at the entrance. In addition, the owner, Kaoruhei Tsuta (Mansaku Ikeuchi) was waiting in the mountain cottage. Tenda, Takashi Tachibana, and Tsuta are high school classmates. Tsuta has also invited Della (Hiromasa Taguchi) and Pan (Kento Shibuya) to be guests of the Mystery Society.After allocating rooms, the mystery party starts at night. Tsuta began to talk about her death as the former owner of the villa fell off the balcony.

When Totonou Kuno (Masaki Suda) and Leica (Mugi Kadowaki) are enjoying a footbath in the greenhouse of Ohnei General Hospital, Manami Umezu (Atsuko Anami) comes and talks about how to spend the New Year. On the way to the hospital, when Sei, who saw the shrine, invited Leica to go to the shrine for the first time, Manami recommended that we go together. Leica also agreed, so Sei promises to go at 3 am on New Year's Day.From New Year's Eve, he spends his time in a small event with just two people, and joins Leica at the shrine at the appointed time. While being puzzled by each other's first visit to the shrine, Sei and Leica enjoy visiting the shrine, drawing fortunes, and enjoying the takoyaki at the food stalls. Seiko Furo (Sari Ito) and Yuto Ikemoto (Matsuya Onoe) see these two people. The two were driven into a New Year's patrol. When Ikemoto sees Leica, he notices something, but the bath light prompts him not to disturb them and returns to the patrol.Upon leaving the shrine, Leica invites her to eat yakiniku. She says that no store is open at this time on New Year's Day, but she has already found a yakiniku restaurant with Leica lit. When Sei looks into the store, there are Kunio Urabezawa (Keisuke Horibe), who seems to be the owner, and Sayaka (Mirai Shida), a clerk. When asked if Sei was still open, Kunio said he was trying to close it. However, Sayaka accused Kunio of not being able to return the customers early in the new year, and welcomed Sei and Leica. From Sayaka's words, it seems that Kunio has a relationship with her father and daughter. When you get to your seat, Leica tells you something in order with a code of numbers. It's annoying to check in 'Self-reflection record'. When she starts eating her roasted meat, Leica tells the story of her sister Chiyoko.