Finally managed to find this visual novel but the issue is that I can't surpass the copy protection. I used to be very good in the matter but not anymore, it seems.
After installing the game I have these extra files:
rurur_update12 (normal update)
R.U.R.U.R ID認証回避 ver.1.2 (only works with the 1.2 game exe)
(NoCD Patch) AlphaROM 3.x .000生成型汎用 rev2 (this is the one that screws me up because I have no idea what to do with it, tried to open the game.exe and reg.exe with it but nothing.
After installing the game I have these extra files:
rurur_update12 (normal update)
R.U.R.U.R ID認証回避 ver.1.2 (only works with the 1.2 game exe)
(NoCD Patch) AlphaROM 3.x .000生成型汎用 rev2 (this is the one that screws me up because I have no idea what to do with it, tried to open the game.exe and reg.exe with it but nothing.