This is the first time I saw a side character, that is not appear that much, that is a tsundere. Also, I did a quick of this manga, like what happen to the rest of the chapters. Oddly enough, looking at the search result, this doesn't come up on any digital manga like renta. I began to question if this really is a manga or is it actually a doujin. My guts feeling telling me this is a self publish story by Asou Kai sensei (pretty much like a doujinshi I guess). alright, reading sensei introduction on the first chapter, it seems like she said there's gonna be 4 books, but have a happy ending. Chapter 4, which is the 4th book, ended kinda 'not happy ending'. So I think its ongoing? But its been like almost 9 years since the first book, so idk. Its an unfinished doujin, lets just say that.