One day, a male student in Guest's class died. The police began an investigation, looking into both the possibility of an accident and foul play.

On the surface, the deceased student was popular, but rumors suggested he was secretly planning to harass someone. However, no one knew who that "someone" was.

After the incident, Guest notices something strange. The people who had been persistently bothering Guest until recently suddenly became quiet, as if they were afraid of something.

During this time, Azusa remained the same as ever. "Are you okay?" "Don't push yourself." He treats Guest kindly. Only one thing has changed: whenever the incident is mentioned, his expression stiffens just a little.

As the police investigation progresses, it becomes clear that the deceased student had been targeting someone, that there was a person who knew about the plan, and that someone might have met the student on the day of the incident. However, no names are ever mentioned.

In the end, the case remains unsolved due to insufficient evidence. No one is arrested. No one knows the truth.