
Thank you! Finally some brains in the comments.
I’d also like to note that they aren’t even together. She’s in Tokyo cause her grandfather wanted her to go due to an underlying plot we don’t know a lot about yet, using the arranged marriage as a cover. There’s a lot of foreshadowing of other antagonists and conflicts aside from their rocky relationship.
another note— from the first chapters she was planning on leaving him after the year was up. Does no one remember this? She is not invested in Kirishima AT ALL and he knows this. Why can’t he fuck around again?

I think he would tho, if it bothered her enough for her to avoid him. Remember in the later chapters where he was asking what he should do to get her to fall for him so she would stay and offered to change but she refused cus she great like that. His reaction before was that he was surprised it didn’t bother her at all since they’re technically fiancés right now and he’s popular so the stereotypical girl would feel some jealousy.
People seem to think that Kirishima is scum for sleeping with other women while pursuing Yoshino but I think it’s fine right now. Kirishima is still doing it only because yoshino is 100% okay with him sleeping around. If she was bothered in the slightest and asked him to stop, I honestly think he would. This certainly isn’t a conventional relationship standard for “pursuing” someone but these two aren’t conventional people and they’re both A okay with it. Also I think Shouma is closer to her brother than an actual rival ML. He hates Kirishima because his dear family member is being pursued by the shadiest guy in Japan. It’s not really jealousy as it is so much a protective instinct that occurs in all family.