Hey, circular plot doesn't mean boring story, this is a genuinely really good story, and even though its circular and you know "ijin is gonna beat up the bad guy and everyone lives happily ever after" the best parts are when you get to see how well fleshed out all the characters are. Like the numbers helping save his family even though they have no reason to and still hold a bit of a grudge against him, they still care about him, and want him to be happy because him being happy is living proof that they could be happy too.
Srry for nerding out there, I just like the story (￣∇￣")
Haha nerd away fellow fan!
listen, I fully realize how circular this plot is and how you can always predict the next arc but I still love it and look forward to reading more