As soon as he crashed into an open field, Nobutsuna Shigyou immediately used Flash Step to gain as much distance as possible.
Several tens of kilometers away from the castle, he heard Chika speaking behind him, "Afraid of the old man?"
Nobutsuna stopped running and slid through the ground while turning around, "Who isn't? You've seen his face and he's incredibly pissed. Even if I can't die, I'd still hate to deal with that." He knew he couldn't run away from Chika who had the best Hohou (Step Method) techniques among them but it was enough for him to get away from Yamamoto's wrath, 'And who knows? Maybe his Bankai is capable of killing us. I don't want to risk it.'
Chika appeared not far in front of him and tapped the ground several times with his foot, "I agree. That old man is so ridiculous that even his enemies don't want to deal with him directly."
Nobutsuna smirked at him, "But I'm thankful for you taking me out of that place. I didn't really expect that the old man could remove the chains considering the weight he carried on his shoulders. Is he a lot more innocent than we initially thought?" Despite his expression, he was incredibly confused by the turn of events, 'I don't know about the last Captain, but even Unohana Yachiru? No matter what you think about it, this is too strange. They got away too fast.'
"Heh? Who knows? Maybe the Captain found a loophole through the restrictions." Chika replied with an equally smug face.
Nobutsuna thought about it for a few more moments before giving up and said, "But of all people, you really went after me? You can't kill me with your ability and even if you could, I'm not sure if you heard me clearly but I'll repeat it, I can't die."
"..."
"You on the other hand, while the hardest to kill among us, are still very much vulnerable to death. So what exactly is your plan here?"
Chika didn't talk anymore and just disappeared from his spot. But without any change in his expression, Nobutsuna just raised his Zanpakuto to his left and received the slash that was aimed at his neck, "And if it's just containing me, Saitou and Katori could do a better job than you."
Chika used Flash Step again to gain some distance from him, "That's true, isn't it? My specialty is assassination so I'm technically a bad match against you who's also mainly practicing martial arts."
It was then that Nobutsuna felt something weird and saw Chika grin at him, "But since our last meeting, I've expanded my arsenal."
On the arm that Nobutsuna was holding his Zanpakuto with, a weird circle filled with various geometrical symbols suddenly emerged before exploding.
"Kughhh...." Nobutsuna jumped back and gritted his teeth while grabbing the falling Zanpakuto with his other arm and swinging it behind him where Chika was already poised to attack.
The clash between the two of them created a spark but it didn't end there as Chika leveraged his advantage on Nobutsuna not knowing what happened to get a few attacks in.
A series of metal-on-metal sounds rang out multiple times per second and dust kicked up, blood hurtling away as the both of them tried cutting each other.
Although Chika was in an advantageous position, he soon had to switch his stance and take a more defensive approach with his opponent's blasted arm regenerating, "Tsk." Chika couldn't help but click his tongue while narrowly dodging a strike to his shoulder that cut his clothes.
With an overhand swing using both of his arms, Nobutsuna gleefully mocked Chika, "Too bad. Your flesh is not as disposable as mine. Not when you haven't activated your Bankai, at least."
Chika blocked the overhead strike and it resulted in the ground below him cracking slightly. With a wry smile, he replied, "Don't call my Bankai disposable flesh."
Nobutsuna let go of his left hand and sent a punch toward Chika's stomach, "What else could it be called?"
"..." Chika was quiet for a moment before his wry smile turned into a grin as he blocked Nobutsuna's fist with his own, "You've become weaker, haven't you?"
Of course, Nobutsuna wasn't happy with his remark and put more strength into his arms, further pushing his opponent down, "Ridiculous."
"What I meant is that you've become complacent. Is it really wise to get close to me like this?"
Nobutsuna immediately recalled what happened earlier and he still didn't understand what kind of attack hit him that time. He took back the strength he was using and tried retreating. However, it was already too late as two more Magic Circles suddenly appeared on both of his arms and exploded. The explosion was smokeless and lightless so it looks like Nobutsuna's arm just spontaneously ruptured.
Taken aback, Nobutsuna failed to notice in time that a blade was already lodged in his neck and cutting it open.
A second later, his vision began spinning as he dropped to the ground while hearing Chika's voice, "This carelessness has become ingrained within you. I guess a thousand years of immortality isn't all that good."
Finally, Chika stepped on his detached head and crushed it into a pulp.
But as soon as Nobutsuna died, the chains on his body started moving and soon enough, his missing head began regenerating.
'No matter how many times I see it, I still can't get used to it.' Chika thought to himself while putting forward his right arm and said, "Hadou no 63, Raikouhou (Thunder Roar Cannon)."
A blast of yellow lightning smacked into the regenerating Nobutsuna and incinerated him. Although he knew that it would just lengthen the time of him getting back on his feet, he still needed to do his best to kill him, 'I wonder... Will Urahara Kisuke find a way to finally finish this guy off or will I die first?'
Chika strategically paced his attacks to keep Nobutsuna from fully regenerating but from his previous experiences, this could only go so far.
As if it had a mind of its own, the chains would leave the host's body through the ground after its host was killed several times. It would then reemerge some distance away and would complete the revival at a faster pace. Chika, Furoushi, and Batsu'unsai tried thinking of ways to seal the [Chained] but due to this behavior that they couldn't stop, it proved to be fruitless.
Soon enough, Chika saw the chains leaving as if shadows escaping through the ground. As there was no way to contain it, he just waited for Nobutsuna to reappear.
A few minutes later, Chika felt Nobutsuna's strange Reiatsu gushing out along with his words, "Bankai... Fierce Demon: Blood-soaked Demi-God of War and Slaughter."
When he turned to the direction of the release, Chika saw a 4-meter tall muscular man with six arms attached to his torso.