I've had my suspicions that Sumiko-sensei might be American, and this puts a lot of credibility to that lol (if there's any interviews about it, I don't know but I'd be interested to read) I mean, what western teen show DOESN'T have a prom arc; I can imagine her lamenting the idea that she couldn't write one for her characters, then going "Wait, this is my story! Of course they can!!"
love Narita so much, he is absolutely best boy and is just living for this love story just like all of us 10/10