Anal is yet to happen in any route, but the plan is to have strict sub-bottoms and dom-tops. Haruki's the more flexible of the bunch. If sub-topping and dom-bottoming will ever happen in a route, it'll probably be on his. But it's improbable. The setting is a very homophobic / heteronormative one and bottoming is seen as "losing", "being the girl", etc.
I see. That is kind of disappointing to know, but I can understand the reasoning.
Still, I find that dom bottoming can be more humiliating to the top, especially since the top is generally the one that is thought of being in control. So the fact that the top and his dick simply became nothing more than a toy for the bottom to be used makes the domination and humiliation that much more poignant. Overall, great job on the game. I wish you the best.