RC, in this case, does not stand for Radio Controlled, Really Cool or Righteous Chesticles - it stands for "refused classification."
Basically, the Australian ratings board refused to slap any kind of rating on Valkyrie Drive: Bhikkhuni, essentially ensuring the game will not be available for sale in the venerable bastion of glorious beaches and deceptively deadly fauna. It's equivalent to banning it.
It is perhaps worth noting that Australia has uniquely close ties with (unabashedly lewd video game purveyor) Japan given their geographic proximity. Did you know Australia has a phenomenal pearl industry, owned mostly by the Japanese, because the waters around Japan are so heavily polluted they won't support the necessary bivalves? But enough economic history, you're no doubt familiar with the video game history of Australia - specifically, the country's capacity for banning games. Dark Sector, Hotline Miami 2, Manhunt, MeiQ: Labyrinth of Death, Paranautical Activity, Postal, Phantasmagoria, Risen, Saints Row IV, State of Decay, Silent Hill: Homecoming, South Park: The Stick of Truth, Syndicate (2011), The Witcher 2, Duke Nukem 3D, Fallout 3 and Left 4 Dead 2 - all were refused classification in The Land Down Undah.
They refused to even give it their adults-only rating - the rating exists (R18+), but it was only recently established and tends to get slapped on violent games (DOOM, The Witcher III, Dying Light). So why did Valkyrie Drive get the boot? The only explanation the board provided is this:
"The computer game is classified RC in accordance with the National Classification Code, Computer Games Table, 1. (a) as computer games that “depict, express or otherwise deal with matters of sex, drug misuse or addiction, crime, cruelty, violence or revolting or abhorrent phenomena in such a way that they offend against the standards of morality, decency and propriety generally accepted by reasonable adults to the extent that they should not be classified.”Ahhh the West. Land of the free. Home of the brave. And the sort of abhorrent filth that any decent, moral, proper and reasonable adult would find utterly revolting.