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well. now that u see that the 1st bout for rimuru and hinata has ended , now rimuru will go to his town and find out it was invaded by human and 100 of his citizens were killed includin shion, so after that he will plunder the human , and become a true demon king.. then fight with hinata and he will win. then some guests from thre different kingdom will come like from dwargon, and others ,,, than veldora will be freed bcoz rimuru became a demon king and his skills evolved so veldora could come out. veldora will start living with rimuru in human form.. and the rest of the world will know that veldora is rimuru's best friend.
here u go.
https://www.readlightnovel.org/tensei-shitara-slime-datta-ken-wn
and there r some extra chaps after the end. so here they are
https://www.novelupdates.com/series/tensei-shitara-slime-datta-ken/?pg=2
the extras start after 248 maybe. just check them u'll know
Its a complicated think to explain. At the end he was strong enough to become an existence that was a kin to a god. So he had the ability to split his soul and travel to other world. So he used the skill to go back to his previous life as a human saved his humanself and gave hishumanself his memories.

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throughout the whole novel this hinata was someone whom i hated really badly for some reason.. even though her hate or indifference to monster killing without thinking was the cause of yuuki kagurazaka's doing since he was the one who was manipulating her aaaaaaaall this time.