Stars Align is an original series created by Kazuki Akane. Aside from balancing sports and school life, each character has a dark backstory that they must learn to deal with effectively and overcome. From the very first episode, audiences are introduced to Maki Katsuragi, who is physically abused by his father and traumatised from it.
So we know that ep 12 ended on a cliffhanger, with Maki intending to go and actually kill his dad. But then, this anime was said to originally have 24 episodes. If it did, they would not have Makis dad get killed when the story hasn’t even technically concluded. Also the fact that Maki is a 13 year old boy. No way in hell will he be able to kill his dad just like that.
My theory is that he might not be able to kill his father no matter how much anger he has for him; he’s just a child, after all. He’d surely be hesitant, and his father would stop him from doing so, or it could be that the tables would turn, and his father might come to kill Maki Katsuragi. But I don’t think so; he’ll get killed even after going through so much trauma. Or else, the show will be a total disaster and a waste of time. The director probably had stored something better for this story but couldn’t finish it. The anime was good till they left with suspense and such an incomplete story.
I agree that stars align is a good name with a good storyline but the ending was not it. They could have made the ending alot better and this anime demands a proper conclusion so let’s hope that we can get a proper season with clear explanation of what happened in the last episode. And this is completely based on my theory, it’s up to you if you want to believe it or not. As the last 12 episodes were cancelled probably due to being sued or inappropriate scenes that cannot be shown. I hope it helped you.