I've watched and read this manga. If you want to make a movie with actors based off a manga and there's already an anime, as this case, I feel like you need to add scenes that weren't included in the manga/anime but goes according to the main plotline.

For example, they could have deepen the plotline a bit and make it a little more realistic and less childish (i guess). Maybe add some scenes where Ryoma can develop some real feelings for Izumi, instead of just him having a similar eye color to a marble, or add some other scenes where Ryoma and Izumi get to know each other, spend time together, include some tension moments to really make the audience involved with the feelings. Or they could have explore a little more the relationship between the manager and the brother, that would have been nice too.

Instead they just chose to make a live-action movie and this is the reason why Ryoma's actor played Ryoma's role exactly as the anime character. Over the top and exagerated reactions work in anime, mainly because they're 2D characters and unless you gave them some big reaction they look plain but with real people these reactions just come off as cringey and veeeeery dramatic. I didn't not like it but it was just like rewatching the anime. I feel like a deeper plotline, a more developed romance and realistic acting could have really given this better chances.