He’s going some minor antagonist that’s going to try to make Momijikawa his latest punching bag at the suggestion of the long haired guy at the end. That guy was beaten up by Momijikawa a few chapters an ago and wants revenge. He’s just bloodthirsty and likes the thrill of beating the shit out of people, especially those that are weaker then him. He’s a grown ass man fighting kids, probably cause he’ll get his ass kicked by people his age. The first years are probably around 15-16.
My guess is Momijikawa is going to let himself be beat up cause those guys are going to threaten his grandma. Sakura and the rest are going to save the day and help Momijikawa realise how wrong he was about Sakura. I doubt they will be best friends, maybe their relationship is going to be Sakura and Sugishita.
enjoyed the new chapter, but i too have to ask - who is that old man at the end of the chapter, and why does he want to fight kids??