Finally, after experiencing a variety of possible outcomes, I completed the game and received the best ending. The ending I desired was for Mike to be alive again and be able to have girls come with the MC to start a new life. After Astaroth shot Mike, I assumed he was dead.
The plot of this is game incredible, I didn't think his father was his all-time enemy after all.
I really enjoy the game, and I'm looking forward to trying out Eterum.