Inside the house, Yukawa and Kijima sit on opposite sides, along with Kyoko Kijima's secretary. Yukawa tells Kijima about his reasoning, which explains the cause and outcome of the two cases separately, in the process Kijima records Yukawa's voice, and at the end, Yukawa asks Kijima to analyze the reasoning of the case, and the resulting score is D, Kijima tells Yukawa that his reasoning is too rough and asks for a re-analysis of the case.
In the research room, Inoue and Kuribayashi talk about the past, Kijima Seishiro was originally an authority on atomic force research, but because of a serious accident in 1995, the school was a little cold to the discipline, and at that time, Kijima's research was stopped for violating the relevant rules, and he was also dismissed, and it was reported that the informant at the time was Yukawa, a member of the group. In the research room, Inarikai is lectured by Kuribayashi, who believes that the police teacher has delayed his research by asking Professor Yukawa for help, and as an assistant to the scientific community and Yukawa, Kuribayashi begs Inoukai not to look for Yukawa's help again.
The police summoned Kijima Seishiro to learn about the situation, and the shrewd Kijima said that he did not know, the police released Kijima because there was no relevant evidence, and Kijima, who returned home, complained to his secretary Kyoko.
When Yukawa finds Inland Sea, Inland Sea remembers Kuribayashi's words and refuses Yukawa's help. Here, Kijima's secretary Kyoko was found to have committed suicide outdoors, with a suicide note beside him, saying that both murders were committed.
Confused, Yukawa returns to the research room, thinking about the case, Yukawa has no time to take care of other things, which makes Kuribayashi very depressed and angry. This side of inland sea decided not to seek Yukawa's help to investigate the case alone, and the university side Kuribayashi led a group of students to silently support Yukawa to try to solve the problem. Among the materials collected by Kuribayashi, a photograph caught Yukawa's attention, and this photo played the key to solving the puzzle.
In the research room, Yukawa returns to find Kijima sitting in his office, and after some polite remarks, Yukawa re-reasons about the case, takes out the primer that caused the explosion of Lake Longin, and explains the relationship between the three cases. Kijima listened and expressed his appreciation, but at the same time he also expressed his anger that had accumulated for many years, pulled up the curtain on the side, and the inland sea was used as a hostage to bind a bomb developed by Kijima. There are still 3 hours, and the deadline is 12 o'clock, so let's be my Christmas gift to you, Yukawa.
Kijima left, Yukawa boiled coffee, and asked inland sea if he needed it, the panicked Inland Sea asked why he didn't find someone to catch Kijima, and advised Yukawa to leave the scene quickly and evacuate the crowd, Yukawa responded lightly to Inland Sea, and then began to take out the blueprints left by Kijima and start cracking the bomb. In order to ease the atmosphere, Inland Sea said why the bomb developed by Kijima was not a red and a blue two threads, and Yukawa ridiculed her for watching too many cartoons.
Time passed minute by minute, most of the 5 was cracked to the last step, with the disassembly of the shell, Yukawa's pupils dilated, and sure enough, it was usually time to watch some cartoons. Only to see that the last bomb was actually - red and blue double line. There are only 10 seconds left, the clueless Yukawa asked inland sea what color he liked, the confused inland sea panicked and said pink, and then Yukawa picked up the pliers and clicked with a knife...
At 12 o'clock, people were celebrating on the street, and in the research room, Yukawa sighed and said: Your intuition belongs to the supernatural phenomenon, and science cannot explain...