Kaguya sama love is war is one of the most popular manga series as well as anime series but we have to consider how difficult it will be to adapt it in live action form, but this movie was surprisingly good. First half of the movie was really good and engaging but suddenly went down hill in second half. Ending sucked, I think it's only for one installment because they have not left a room for sequel. This character was good but character of Ishigami haven't introduced properly.
Overall its OK to watch. Good for one time watch.