I will leave this here;
The match takes place at the beginning of the series, before Lind L. Tailor, and Ayanokouji has access to L’s resources, which means Interpol.
Light starts off by killing criminals, as we saw in the anime. This will make him start developing his god complex and will make himself known to the world. From here, Ayanokouji would need to deduce the following:
- The time when Light kills (after school hours)
- His location
- How he is killing the criminals
Here, Ayanokōji, with the Zodiac Exam feat, will easily identify the pattern of the killings. For the location, he can infer from the first victim that it was in the Kanto region, as that is where the first recorded death occurred.
Light will begin by using irregular heart attack deaths and later manipulate criminals into leaving messages and performing rituals in order to make himself known. However, this will eventually become suspicious, as Ayanokōji will notice that only criminals are dying. Not to mention, he would also realize that the deaths consistently align with criminals who are publicly reported in the news, leading him to conclude that Kira is selecting targets based on accessible public information—meaning Kira requires both a face and a name.
Next we move to the suspect list..
From here, Ayanokōji would psychoanalyze the perpetrator, concluding they possess a warped sense of justice. Given that the killings only occur after school hours, he would deduce that the culprit must be a student. He would also infer that Kira must be among the most intelligent students, as the killings are highly meticulous and are accompanied by a deliberate message warning that criminals must die. This level of control and intent would further lead Ayanokōji to conclude that the perpetrator is developing a god complex.
He would narrow it down to Light and begin investigating his public records. He would immediately discover that his father is a police officer, which makes it more plausible why Kira has a strong sense of justice, as it could stem from admiration or influence from his father.
Next we move to what Ayanokouji would do from here;
Obviously, given Ayanokōji’s personality, he would not reveal himself or operate publicly, since he lacks L’s competitive need for direct confrontation—one of L’s key weaknesses. Instead, Ayanokōji would prioritize indirect observation, gathering information on Light from a distance: his social dynamics with his family, his behavior patterns, and any meaningful public records related to them.
This approach also avoids the mistake made by Raye Penber, who maintained close physical proximity to Light and inadvertently drew Ryuk’s attention. Ayanokōji would not create any such observable linkage, keeping himself entirely outside of Kira’s awareness.
As a result, Ryuk has no practical means of identifying or reacting to him. Unlike human investigators who leave behavioral patterns, Ayanokōji operates in a way that produces no meaningful signal for observation. In this context, Ryuk’s limited perception and lack of investigative focus make him effectively irrelevant to detecting Ayanokōji’s presence.
Next we move to the traps;
Ayanokōji would wait for Light to leave for school and then use agents to install cameras throughout his house. This works because neither Ryuk nor Light is aware that they are being followed or investigated.
Ayanokōji would immediately notice Light opening his drawer in an unusual way—using the inside of a pen to interact with a small hole in the drawer. This would lead him to suspect it is a trap against intruders, where opening it incorrectly could cause harm.
From there, Ayanokōji would observe Light turning on the news while simultaneously checking it on his own TV or PC. He would then see Light writing the names of criminals. After writing their names, Light typically looks at his watch and waits around 40 seconds before the criminal dies.
As this pattern repeats over a long period, with Ayanokōji observing everything, he would logically infer that Kira kills by writing the names of his victims.
Ayanokōji would then get his hands on the notebook after replicating the exact same mechanism Light used to access the drawer.
From here what happens;
Ayanokōji would see Ryuk, but due to his extreme emotional control, he would not flinch—only briefly register confusion. However, after Ryuk explains that anyone who touches the notebook can see him, this would significantly reinforce the hypothesis that Light is the culprit. The existence of a shared, observable phenomenon tied to the object would serve as strong evidentiary support.
Light would then be detained immediately. Upon reaching court and Light pleading innocent (despite the supernatural nature of the Death Note), Ayanokōji would present footage obtained from the hidden cameras.
At first, the court might attempt to dismiss this as coincidence or misinterpretation of events. However, this argument would collapse under scrutiny if Ayanokōji demonstrates the notebook’s properties directly—either by having the judge touch it and perceive Ryuk, or in a more extreme scenario, by conclusively proving the notebook’s causal connection to the deaths in a controlled demonstration.
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