Now if this wasn't a visual novel there'd be no issue. A live-action film with the following description would be fine:
"A film that aims to raise social awareness of child and school related social issues through a story about four troubled heroines who, under unexpected circumstances, join forces with a young hapless teacher to fight against the evil forces that mean to exploit children."
Visual Novels (and to a lesser extent anime) just have a very seedy reputation in the west.
Predictions (Made July 2019)
LTD: PS4 - 130m, Switch - 110m, XBO - 52m 2019 : PS4 - 15m, Switch - 18.8m, XBO - 4.8m 2020: Switch - 22m (Peak Year)
Switch lite really screwed up my Switch prediction this year! Looks like it's going to be about 19.5m-20m for the Switch in 2019, 14.3m for PS4.