Quote for those who don't want to visit the link:
The origin of the Steam ban.
I thought the ban came from using the term high school and dating sim in the game which implied minors. I guess there is no such thing as an 18-year-old high school student. The other problem was Chiaki, it's a character that was deliberately underage but had no lewd content (which is perfectly normal).
Steam refuses any representation of a minor in an adult game, whether there is content about her or not. As long as Chiaki is 12 years old in the game, Steam will never accept the game. The good news is that even after a so-called ban, it's always possible to take the Steam validation exam by paying again the 100$ fee.
Soooo... Yeah, I don't think Steam will work.