Does this movie actually deserve a 10? No. But it was really enjoyable and interesting to watch. And I wanted more of it. I wish it was a series instead. So, the 10 I give is not because this movie is a 10 but because the enjoyment it gave me is 10/10.
After watching it I really wish Japan would adapt more of those webnovels and manga based on western fantasy where everyone is Japanese but has English names and set in fictional western based countries. They could just be fun little series and I would really enjoy watching them a lot. Korean ones would do too but they can be more serious and Japanese ones more light hearted. There are so many great stories in those webnovels, webtoons and mangas. I wish I could watch them as live action series.