It's great as a prologue to something much bigger <3.
It makes you want to explore the world and the story of Kyu and Mairo and their relationship, how they ended up in this desperate situation, the mother's point of view (I know that this being a BL it is likely that she is an antagonist, but having considering how little agency women had at that time I feel more sorry for her), and how Mairo really feels for Mahiro (Call me naive but I refuse to believe that a father can hate such an adorable child) <3.
And knowing the future of this unhappy family, will they end up separating and each for their own while leaving the child in charge of everything? Or will they talk things out and come to a compromise to make life easier?
Honestly, I would have liked Kyu to scold Mairo, because it's not right to treat the child like this for something that isn't his fault lol.