Rather than moving forward in the story a bit let go back for a bit to cover just how some of the things that are currently happening came to be. Izuku's summoning to this world and actually living to pass the initial summoning lead to changes. Various changes not just in the present but in the past as well. They were changes that were leading to certain things not adding up, events happening out of order, and others just not happening at all. All of them leading up to where Rimiru was watching Chronoa and Deku fighting each other in what seem to be a serious sparring match. Curious about how to do about stopping them without getting dragged into the fight himself for various reasons.
As for Izuku went when he vanished it was similar to something that happened to Chloe's summoning. She was supposedly summoned to a time period three hundred years before the present then seemingly summoned again to the present day. Meaning she was summoned twice but not going into details about how or why as that really is not the point in bringing this up at all. Rather just focus on what happened instead of the why and how it happened.
With Izuku's summoning, it was the reverse as he was summoned first to the present era of Rimiru's world and then summoned again to the distant past of over two thousand years ago. Other than the fact that he was summoned twice seemingly by possibly two different people with possibly different yet currently unclear purposes. He then arrived in that distant past the same as Chloe however rather than arrive in the same place as her. He only arrived in the same time period instead of arriving in a completely different place altogether. A location where a lack of knowledge about where and even when he was would cause some misunderstanding that would last through the various eras. As Izuku's heart might always be in the right place but that did not mean his action would produce the intended result. Although correction would be made either but for him or him by those around him when needed. Though it would be some years before Izuku and Chloe would cross paths with each other.
One where both were somewhat in bad mood at the time over something that happened and were actually on a different side of a conflict that was happening. Which lead to them fighting each other as this was a time where Chloe herself was still nowhere near as strong as she would become however had grown enough and had enough actual combat experience to fight a serious Izuku to draw. Then start traveling together from then onward after they both learned they were being used by both sides of the conflict through Izuku realizing various things that did not make sense for what either side had told them.
Things pick some time after this incident with Chloe just staring down Izuku as they were settled down for the night. They were not close to any towns or settlements thus they were stuck camping out for the time being as a result. Chloe then realized that the stories she had heard about over the years regarding a guy with a strange black arm that sometimes ended up more injured than those he has defeated were all about Izuku, himself.
"I thought that I told you not to ever harm yourself like that again," she said annoyed
"It is not every time that happens...at least that badly just when it moment calls for it," he said
'You lost your right arm during one of those times did not you and were lucky not to die' Hinata added
"How am I even able to hear you and why are you even in Chloe to start with," Izuku asked.
Hinata just mentally shrugged before saying 'At least I can be more useful this time around'
Though confused about what she meant by this time around he did not really go any further into what that actually meant. Mostly because Chloe has asked him not to dig any deeper on that issue as she would tell him eventually but she was not currently was important.
"It might be okay when we are alone like this but we really should talk to Hinata out loud when around others" Chloe stated
None of them knew why Izuku could communicate with Hinata nor why Chloe and her could do so with the previous One for All user either.
Another interesting thing was how Izuku's hero costume and the cape he currently uses became equipment that could level up and become stronger through the constant battle he has been in. Of course, none of them had an idea about how or why this happened. So they just decided to leave it at that for now as it worked out for him so far.
'So where did you even get the idea to use one of your abilities to make that arm for yourself anyway' Hinata asked
"There was this series that had been running for a really long time where one of the characters lost their arm and used their own power to create a replacement for themselves. They did not seem to be affected by having it constantly activated so I thought I would try myself it worked...eventually. Even refined it to the point where it just looks like a normal arm though it still black though" Izuku answered
"That series is still ongoing but did not they say it was supposed to end in like five years though" Chloe asked shocked
"It was still ongoing last time I checked though they were apparently really close to the end game. Not sure how long the end game itself is going to be though" he said.
Izuku then went on to explain that his Blackwhip arm was him redirecting a habit that he had once developed. One where he would constantly sprout up to six Blackwhip tendrils from his back at a time. Thus his Blackwhip arm was those six tendrils expand upon to replace his missing arm.
