Publisher MangaGamer is pretty much directly what you think it is. In a recent talk with Siliconera, the company divulges their relationship with Steam as a visual novel stable that also happens to peddle tons of smut.
At first, Valve had no interest to put MangaGamer games on Steam, which the publisher thought was a bias against visual novels. Given that genre only began turning up on the storefront fairly recently, they could be on to something.
Everything changed when Steam Greenlight started allowing basically anything to be put up, so that the community could decide what they wanted. There was still resistance, however, as some people were trying to target and downvote MangaGamer titles.
Eventually, the publisher was able to get Higurashi When They Cry and Go! Go! Nippon past Steam Greenlight. In the latter case, the title went on to sell 16,000 copies, breaking open a line of communication between MangaGamer and Valve.
With this new relationship, the company hopes that more of its titles will eventually come to Steam. For instance, it has an Ozmafia “otome” series directed to a female audience that it would like to put on the store.
MangaGamer omits in the conversation that a reason for initial friction is also likely due to the company unabashedly selling some frankly disgusting games. Some gems include titles like Ultimate Boob Wars – Big Breasts vs Flat Chests or, and this is not a joke but the actual name, Suck my dick or die!.
Here’s an excerpt from that last one, just in case you weren’t yet fully convinced of its dubious nature:
Mr. Prosper, who is the commander of the military, advanced his men to this small village to hunt the guerrillas.
But the incident was all planned out by him, so that he could have a raping party for himself. The girls, who were suspicious as guerrillas, were arrested. That was the beginning of the insane raping party.
In its defense, MangaGamer works to support “all-ages” versions of its games as well, such as Cho Dengeki Stryker that released on Steam last month. Naturally, removing the juicy bits upsets the core fan base of this sort of visual novels.