If I may, while I understand that you hold yourself to a high moral standard and do not want to engage in these actions it's important to remember that we're all human out there, and it's very unhealthy for most people to hold themselves to a standard of perfection. To these people being able to have an outlet for these emotions that is safe and doesn't harm anyone directly can do wonders in helping them be able to accept themselves, deal with their emotions, and continue to live in peace with those around them. While I get that the game isn't for you because you can't stomach such actions being forced on the player, it is important for us that 'Hero' is a character all of his own with his own personality in a world that's not the best place to live, and while to a player he can fulfill various fantasies (you'd be surprised at how large our female audience is, both inserting themselves into hero's perspective and those even inserting themselves into the perspective of someone in the harem), the Alina scene in question helps serve to make it very clear to the audience that the story won't always go how they want and if they're not willing to explore the sort of character who Hero is that now is a good time to get out. That said, we'll talk about some if we might be able to make the description of the game a little more clear about what it is, but I can't promise much as some of the sites we host on are a bit more strict with the description of the game than the game itself.
Also, a bit of an aside but I do feel that I've got an obligation to point out to you that Renryuu has plenty of actions in it required for the story that would not fit your viewpoint, such as lying about your identity to seize political power over a sovereign nation, carrying out unjustified wars, having sex with women under false pretenses, having sex with employees, and killing others who happen to be in the way of your goals. While you may be okay with these certain things, I think that it's important to point these out as it feels like your viewpoint is inconsistent, having dealt with some instances where that's been the case myself I thought it'd be good to advise that maybe you reflect on why you're okay with Renryuu having these things but not okay with Harem Collector having it's morally reprehensible actions as understanding why one is okay with you but the other isn't is an important step to understanding yourself and being able to voice your thoughts effectively!