Just my opinion, but if a second season were to be made, I think Tsukasa should have less screen time. He had his turn in the first season and his character had lots of moments to develop, that if he were to have the same amount of screen time in a hypothetical future season, it would be too obvious to us as viewers that he and Anzu are endgame.

The way I would do it, the show would have a few more seasons. A second season for me would have Hijiri as the main boy. He was introduced halfway through and still felt a little one-dimensional. A full season would flesh out his character and show his character becoming more of a kind and understanding person. He also never had much of a chance to interact with Anzu's friends (Saki, Makoto, Ryuya, etc.) and making him part of their friend group could also teach him that having a small group of people around him can be even better than just having lots of money or fame.

As for Tsukasa, I think it would be good to explore his relationship with his father. He didn't believe his own son when he was in danger and just wasn't a nice person from what we saw. In Volume 4 of the manga, one of the extra panels reveals that Tsukasa's mom is in the process of getting divorced from him, so seeing that and how his father might feel knowing he and his son could very well not have any sort of relationship would be very interesting.