Former employees of Quantic Dream are claiming inappropriate behaviour, sexism, and homophobia are all commonplace at the Heavy Rain developer.
Three French outlets have published stories on the studio, and as translated by Eurogamer, they claim that Quantic Dream leaders David Cage and Guillaume de Fondaumière are complicit in the alleged behaviour.
The accusations began after about 600 photoshopped images dating back to 2013 were leaked from the company.
"The most shocking present Quantic Dream's collaborators in sexual positions, adorned with homophobic or sexist slurs, or even made up to look like Nazis," said one report.
The images were apparently sent in group emails around the company – including to recipients Cage and de Fondaumière – but complaints were only made in early 2017 after the company's IT manager was the subject of a photoshopped image.
Cage and de Fondaumière claimed not to have seen the worst images before then, only ones which "were funny or more or less amusing".
Elsewhere in the reports, Cage is painted as a man who is difficult to work with, demanding long hours and not listening to others.
He is also accused of making dirty jokes and inappropriate remarks about actresses in his games, as well as homophobic or racist jokes.
"David Cage has a very particular viewpoint on how he runs his studio, which in his own words he sees as a private, or a semi-private, space," said one former employee.
"He feels he has the right to say whatever he wants, it's his place."
Cage said the allegations were "ridiculous, absurd and grotesque".
"You want to talk about homophobia?" he said. "I work with Ellen Page, who fights for LGBT rights. You want to talk about racism? I work with Jesse Williams, who fights for civil rights in the USA... Judge me by my work."
The reports also claim Quantic co-founder Guillaume de Fondaumière has a reputation for hitting on staff at parties and for forcing kisses on them.
"I will be extremely clear: it's absolutely false," responded de Fondaumière. "None of any of this happened at any evening event."
Cage and de Fondaumière denied all allegations, and said they were shocked and surprised by the "rantings" of the former employees.
Quantic Dream's next game, Detroit: Become Human is due to release for PlayStation 4 in the first half of this year.