Third person POV
[A flashback of Hayate to two days before Gen asked Reina to stab him with his katana for killing his parents…]
A vial of the zombie virus was shoved into the mouth of a terrified civilian by Hayate. "Time for you to be a variable of this experiment," he chuckled darkly.
He watched as the man turned into a zombie with red eyes.
It was his 79th target.
2 days later, he and others in the Yami Kuro Yama organization ran to Gen's zombie arena when they heard Reina's cries. There they stopped and became frozen in shock. Gen's body was on the tiled floor in peace for his death to atone for his sins and to atone for his atrocious on Reina's parents.
When Reina begged them to save Gen, Hayate and his squad did so.
3 days later, Hayate was with Nato and Arashi when Reina punched the mirror with his left fist in the second floor.
There Hayato saw the mirror in Reina: he harms himself to punch the monster within him. Hayato became guilty and went into a toilet stall holding a vial of the zombie virus. "I could be like the zombies and die a martyr…" his mind wandered.
But seeing how Reina was punching the mirror out of self-hatred, Hayate decided not to and tucked the vial into his vest to be placed in the crates later.
Then, the next morning, Hayate was shocked when he and a few paramedics came and saw that Reina was having a seizure on his bed because of PTSD of his own guilt. He helped out holding his legs as a medic injected a stabilizer to stop the seizure.
A few hours later, he was in Gen's ward after Gen woke up from his coma. Gen ordered all zombie infections to be halted permanently and the clearing of zombies and doing of rescue operations to be commenced before he could go to Reina's room to reconcile with him.
[Flashback ended…]
Later on, Reina and his two escorts are now walking down the streets with Mara and Martha. They decided to escort the twins to Gen's headquarters for their safety. At this point, Reina didn't want to tell the twin women about his past actions on Gen. Not long after, the five of them arrived at the location of Nato's squad vehicle. There Nato saw them coming, and so, he went to them. "You guys are back. How's the area in the northeast?"
"Nato-san, it's not much compared to the southwest part of the city," Reina answered back like an obedient soldier.
Mara and Martha were stunned to see his affiliation with Nato and thinks that Reina was working with him in order to survive the zombie outbreak.
"Okay, good," Nato replied back, before looking at Mara and Martha. "Oh, are those two survivors?"
"Yes, we are," Mara responded back, "and we are running out of food."
"Ah, I understand. Come with us. We'll take you two to our headquarters for your safety.
Thinking that they will be in a safe place, Mara and Martha nodded to say yes.
And so, all of them, alongside the rest of Nato's squad climbed into the squad vehicle, which is a truck of Gen's organization.
Not long after, they left the area and back to Gen's headquarters in the eastern side of Tokyo Bay. But along the way, Reina finally reveals to Mara and Martha his past actions on Gen and why he did that. Then, Mara and Martha were shocked to hear that and couldn't believe that their own friend would do that.
"Is that true?" Mara asked.
Reina then nodded while feeling guilty.
"That's the thing he hasn't recovered from yet," added one of Nato's squad members.
Reina was sitting next to Mara and Martha while looking down from guilt.
Then, the twins looked at him.
"We didn't you're capable of doing that," Martha said to him.
"Yeah…" Reina responded back, "…I'm sorry, guys. I failed you."
"Please consider his feelings as his friends," Nato said to Mara and Martha. "He's trying his best to atone for his sins."
Mara and Martha then understood that, not want to leave their friend behind just because he did something wrong like that.
Not long after, they arrived at Gen's headquarters, and the squad vehicle entered the gated property. Then, it parked somewhere near another building, and once someone opened the doors, everyone in the back stood up and got off. Mara and Martha were a bit astonished to see their new place to live for now. Reina then came to them and said, "Yes, this is it."
He remained positive to try to cover his guilt-ridden self.
"Oh, okay," Mara replied as she glanced at him.
She and Martha only had backpacks and baseball bats as their only weapons.
Reina then looked at the main entrance to the main building and felt as if his stomach was sickened by it.
His guilt again threatened to manifest in front of his friends.
But Reina managed to resist his inner demons of guilt and regret while Gen and Arashi came to them.