Highschool of Succubus is several versions outdated here.
Highschool of Succubus (https://two-succubi.itch.io/hos/download/eyJleHBpcmVzIjoxNzAxOTAwNzI5LCJpZCI6MjMyNjkwfQ%3d%3d.uOkyOi5lMae3es%2bXB5XdRRSW5HI%3d) (current public version as of this posting is 1.74)