This first chapter is certainly starting off strong! From that sweet first coloured page of Ikumi at the beach, through page 9 where the box with "so that darkness will never imprison you" is surrounded by black, to the very end with the stunning reveal The moment they mentioned "The Tarantella" by David Popper, I opened it up and played it in the background while reading. I feel that it truly fits Tetsuo's playfulness and free spirit and I find it hard to believe that Ikumi would play it. He's probably going to pick something like van Goens's take on it, which is slower and more dramatic. It's both heartbreaking to know that they chose the same piece and funny to imagine how Ikumi will give a refined elegant performance, after which Tetsuo will probably storm in and play a jovial tune that is closer to the Italian nature that this song carries with it.
We also have hints of blackmail from that judge, likely along the lines of "That boy poses a threat to my little idol's future, so take him back to Italy and bury him there". I hope it's not the case, but I've seen it enough, not to mention in happens in real life. At least Ikumi is making progress with Tetsuro!