To put it bluntly, the Chief is the top student of their cohort, and the Vice-Chief is the second-best.
Kurona and Nashiro Yasuhisa wanted to simultaneously occupy both the Chief and Vice-Chief positions, and even without Yakuchi Kei's sudden appearance, it would have been very difficult for them to achieve this.
In other words, Kurona and Nashiro Yasuhisa were already under immense pressure, and Yakuchi Kei's sudden appearance only doubled their stress.
Therefore, their hostility towards Yakuchi Kei was very deep.
Yakuchi Kei now completely understood the reason; it was indeed as he had guessed, related to Akihiro Kanou.
"One can only say that Akihiro Kanou truly harmed these two sisters terribly..." Yakuchi Kei murmured softly.
If Akihiro Kanou had shown even a little consideration or care for Kurona and Nashiro Yasuhisa, he wouldn't have said that.
In the original work, Akihiro Kanou deceived the Anjiu sisters into undergoing artificial Half-Ghoul experiments, which he personally performed, transforming them into One-Eyed Ghouls like Kaneki Ken, using Rize's Kakuho and Kagune.
Later, when Akihiro Kanou's underground laboratory was discovered, Aogiri Tree, the CCG, and the team led by Jinmu Ken surged into the lab, and Kurona and Nashiro Yasuhisa, in an attempt to protect their "father," encountered Suzuya Juuzou, who was already a Second Class Investigator.
Even though they were One-Eyed Ghouls, the two of them together were still no match for Suzuya Juuzou.
Perhaps holding a grudge from how the Anjiu sisters had been dismissive and cold towards him in the past, Suzuya Juuzou not only made harsh threats, vowing to dig out their intestines to compare whose was longer, but also acted viciously, severely tormenting the two sisters.
However, Suzuya Juuzou ultimately did not kill them; when Anjiu Nairo was severely wounded, he spared Anjiu Kurona's life.
Anjiu Nairo was on the verge of death due to her severe injuries, and Anjiu Kurona hoped to find her "father" for help.
However, Akihiro Kanou had already partnered with Aogiri Tree at that time; Aogiri Tree protected him from being captured by the CCG, and he continued to conduct artificial Half-Ghoul experiments for Aogiri Tree.
As for the severely injured and dying Anjiu Nairo, Akihiro Kanou completely ignored her. While there was indeed almost no hope of saving her, his attitude showed no humanity whatsoever.
Anjiu Kurona, worried that Nashiro was about to give up, absorbed Nashiro into her own abdomen, left alone to find a way to save Nashiro.
The ultimate outcome, of course, was that Nashiro could not be saved and completely merged with Kurona, without consciousness or vital signs. Akihiro Kanou even dismissed Nashiro's only remaining faint breath as just "farting."
In short, Akihiro Kanou was a thorough villain, whose disregard for human life surpassed that of Kamishiro Rize, if not equaled.
He was the kind who could not be whitewashed, but at the same time, he was a villain with great personal charisma.
He never regretted anything he did, even until the end of his life, because his goal was the same as Nimura Furuta's: he believed this world was confined by a twisted "birdcage," and he wanted to break this "birdcage." Only a "One-Eyed Ghoul" could achieve his goal, and for this, he would spare no cost.
Facts proved he succeeded; Jinmu Ken, whom he created, fulfilled his long-cherished wish.
The root cause of all this was Akihiro Kanou's mother, who died from an incurable disease. But in his view, if Ghouls could be used for medical research, corresponding effective medicines could surely be developed.
Therefore, after his mother's death, he changed, believing this pathetic world must be reshaped. He fully knew how evil his actions were.
So, before the new world was about to arrive, he, believing that the new world could not accommodate a villain like himself, chose to commit suicide by shooting himself. This was also an embodiment of his extreme rationality.
Finally, dying in front of his mother's grave, he must have had no regrets and never believed he was wrong.
Later, medical research on Ghouls and "dragon cells" quickly overcame many incurable diseases, including Shinohara Yukinori, who had been in a persistent vegetative state, who fully recovered.
"Now they don't have much chance to use Kamishiro Rize as an experimental subject. I wonder what Akihiro Kanou and Nimura Furuta will do next..." Yakuchi Kei thought about some things, completely oblivious to the various gazes directed at him.
After all, two cute girls who happened to be twins, leaning on his shoulders on either side, such a situation was too conspicuous.
He couldn't just directly shake Kurona and Nashiro Yasuhisa awake and tell them to move.
...
It was almost the stop where Kurona and Nashiro Yasuhisa were supposed to get off, but the two sisters still showed no signs of waking up.
Yakuchi Kei remembered that Kurona and Nashiro Yasuhisa were supposed to get off at this stop, so he spoke up to remind them: "Kurona, Nashiro, you've arrived at your stop."
At the same time, he gently nudged them with his shoulder, which finally woke Kurona and Nashiro Yasuhisa up.
"Hmm? ...Are we there already?"
Anjiu Kurona was a bit groggy from sleep. She lifted her head and rubbed her eyes, not realizing what she had just done.
Anjiu Nairo, on the other hand, reacted immediately. She suddenly felt very embarrassed; she had accidentally fallen asleep just now, and even leaned on Yakuchi Kei!
Anjiu Nairo, her cheeks slightly red, stood up to get off, pretending not to know anything.
Anjiu Kurona still didn't feel anything was amiss, and then she followed Nashiro off the car.
Yakuchi Kei remained silent the entire time, acting as if nothing had happened.
After Anjiu Kurona and Anjiu Nairo got off the car, Nashiro noticed that Kurona's face showed no sign of awkwardness, as if what had just happened had never occurred.
But Nashiro had woken up a little earlier than Kurona, and she had seen Kurona also leaning on Yakuchi Kei.
Did Kurona not care at all?
Anjiu Nairo was curious about this and, somewhat concerned, quietly asked Kurona, "Kurona... don't you know what you just did?"
"What did I just do?"
Anjiu Kurona didn't know what Nashiro was talking about for a moment.
"It's just that, you accidentally fell asleep just now, and you were even sleeping on Yakuchi Kei's shoulder..."
Anjiu Nairo briefly explained the situation to Kurona.
"..."
Anjiu Kurona paused for a moment before realizing, her eyes widening instantly, her pupils trembling slightly, seemingly in disbelief, "I... I slept on his shoulder?!"
Anjiu Nairo felt relieved now. She had thought she was the only one extremely embarrassed, but it turned out Kurona was just completely unaware of what had just happened.
However, the most important thing was that Yakuchi Kei knew exactly what they had done, and thinking about this made Nashiro feel even more embarrassed and shy.