What's with all that hitting between girls? Is that some kind of stupid trend? That kinda ruins the mood. Why would you ever want to hit your girl? The one you love above all things! Damn that's insane (
The art style of in this manga makes it more intense, but hitting your love interest cliche has been used in many romance genres and portrayed as comedic, this one isn't able to do so because of lack of frames.
The beginning chapters of the manga did have an angst feeling to the abuse because of the parents, and certainly was violent when the friend and sister (thinking her to be a man) punched her.
But that last page had way more unexpressed emotions in that hit than violence. Because for Iori, after having constant toxic relationships and becoming numb to breakups, finally found someone who simply wanted to stay by her side, thats all she wanted and she is filled with happiness. She's even ready to beat up someone with a bat to get her girl back. Even after all this Minami thoughtless says something like "Are you really okay with going out with me?". (There are times when thoughtless words uttered by loved ones become way more painful than being stabbed by a blunt knife). In that moment Iori reacts the only way she could, she reacts impulsively and slaps her. You can't have someone like Iori remain calm and collected when they hear something like that from the very person she loves! There is no way she could have responded to that situation with a "I love you" or kiss her to reassure Minami.
Everyone is recognizing Minami's tragic past but are completely overlooking Iori's toxic experiences with relationships!!