There's nothing to fight, manga publishers, specially the editors like to "stretch" it. This is a well known fact about mangas for a lot of time, drafts tend to be more proactive in their storytelling but once it gets filtered and revised there's always extra content, SPECIALLY with romcoms, where a random situation can become a single chapter where no actual "development" is shown, and this is what you always experience in these kind of mangas, you just have to bear the inconsequential little stories because they become a "photographic collage" whenever the plot moves a little inch, just like when Sato confessed, all the random little chapters came to his mind.