Totonou Kuno (Masaki Suda), who is admitted to the Onei General Hospital for inspection, goes to the greenhouse in the hospital on the night before discharge, guided by the code hidden in the hospital bulletin board. There, Sei met Leica (Mugi Kadowaki), who conveys words with numbers that combine pages and lines of 'Self-reflection'. Leica, in numbers, disappears by instructing him to come back to the greenhouse at 3 pm the next day.
The next day, after completing the discharge procedure, he went to the hospital restaurant to have lunch until the time specified by Leica. Then, he collides with the patient Ryuta Shimodo (Amane Okayama). I apologize for the adjustment, but Ryuta has a difficult habit and does not forgive. However, Ryuta was frustrated and left when he calmly returned it.At 3 o'clock, when Sei went to the greenhouse, numbers were written on his floor. When I checked it in 'Self-reflection record', it was in the soil of a certain place. When Sei digs there, a plastic bag containing something comes out. At that time, the scream of a woman who stands still. She is Manami Umezu (Atsuko Anami) who manages the greenhouse. The plastic bag was filled by Manami for some reason. After hearing from Manami, Sei solves her worries. Sei, who broke up with Manami, found an envelope pinned to the trunk of the cherry blossoms. When the Leica number to look inside was opened, there was a picture of a wall with graffiti on it. The graffiti looks like a flame-like mark. The address was written on the back of the photo.When Sei went to the address written in the photo, the house seemed to have burned down. Sei found Rikuta among firefighters, police officers, and rubberneckers. Rikuta, who knew that he was being seen in a regular manner, disappeared with Kaonto Ihara (Taichi Saotome) who was talking. Then, before I knew it, there was Leica next to Sei ...

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.