Nakano Eri took the mastermind behind the scenes very seriously, but the results were of no use whatsoever.
The sender could not be identified, and Uranishi Akira was even less cooperative. He had a certain grudge against the Japanese police and refused to disclose the changes in his mindset over the years, let alone whether anyone had instigated him.
On the contrary, seeing the serious expressions of Nakano Eri and others after the fruitless interrogation, he smiled with a particularly mean satisfaction.
There wasn't much Nakano Eri could do, and Kiyomi Liuli also had no good solution. They could only be extra cautious on a daily basis, but as for Nanahara Takeshi, he remained indifferent—he and the mysterious person X were not enemies. In a sense, his existence made the "game" of the mysterious person X even more interesting; there was no reason to plot against him.
Since his safety wasn't an issue, why worry?