I just wanted to make a note that Kazuki's character was underrated
He got a lot of well-deserved praise from his co-stars, the production team, many Japanese fans and ... Takahiko Kozuka (who watched the show live in the arena with Javi Fernandez)! What's most impressive to me is that not only did he and Koshiro play the young versions of Kakeru and Tokio and portrayed another prominent character with their own scene each, but that they were also part of several ensemble numbers (e.g. as sheikhs in the first scene with Shizuka or as blackhooded "villains" in the "black hole" scene towards the end).
Once we talk about it, do you have a full list of episodes and performer names? I know that I might be asking too much but... Could you post it?
I compiled Act I with the help of a playlist that was shared by a kind Japanese fan (this was more time consuming than I thought though, so I'll do Act II another time

):
Act I
1. Opening dialogue (Takuro Ohno, Daisuke Takahashi, with: Koshiro Shimada, Kazuki Tomono)
2. HAMO (Main actors: Kazuki Tomono, Koshiro Shimada / Main singers: Kai Hasegawa, Eliana, Marie, Masahiro Ehara)
3. 友 〜旅立ちの時〜 (engl. “Friends – Time to depart/start the journey”) (Main actors: Kazuki Tomono, Koshiro Shimada, Ayumi Urabe, Daisuke Takahashi, Takuro Ohno, Kana Muramoto / Main singers: Kai Hasegawa, Eliana, Marie, Masahiro Ehara)
4. うたエール ( “Uta Yell”) (Main actors: Daisuke Takahashi, Takuro Ohno, Kana Muramoto / Main singers: Takuro Ohno, Kai Hasegawa, Eliana, Marie, Masahiro Ehara)
5. Dialogue “Project in America” (Takuro Ohno, Daisuke Takahashi, with: Kana Muramoto)
6. With you (Main actors: Takuro Ohno, Daisuke Takahashi, Kana Muramoto, Kazuki Tomono, Koshiro Shimada / Main singer: Takuro Ohno)
7. 守ってあげたい (engl. “I want to/will protect you”) (Main actors: Daisuke Takahashi, Kana Muramoto, with: Kazuki Tomono, Koshiro Shimada / Main singer: Daisuke Takahashi)
8. 陽はまた昇る (engl. “The sun will rise again”) (Main actor/singer: Takuro Ohno)
9. Award ceremony (Main actors: Masahiro Ehara, Daisuke Takahashi, Takuro Ohno, Kana Muramoto)
10. レトロフューチャー (engl. “Retro-future”) (Main actors: Takuro Ohno, Daisuke Takahashi, Shizuka Arakawa, Kana Muramoto / Main singer: Takuro Ohno)
11. Motorcycle accident (Main actors: Daisuke Takahashi, Takuro Ohno)
12. 表裏一体 (engl. “Two sides of the same coin”) (Main actor: Takuro Ohno / Main singers: Kai Hasegawa, Eliana, Marie, Masahiro Ehara)
13. Tokio finds himself on the train with Kakeru (Main actors: Takuro Ohno, Daisuke Takahashi)
14. 終わらない歌 (engl. “Never ending song”) (Main actors: Masahiro Ehara, Daisuke Takahashi, Takuro Ohno)
15. SEIMEI (Main actors: Marie, Daisuke Takahashi, Takuro Ohno / Main singers: Marie, Ayumi Urabe, Yoji Nakano)
16. Dialogue “Centaurus” (Main actors: Masahiro Ehara, Takuro Ohno, Daisuke Takahashi)
17. イロトリドリ (engl. “Black bird”) (Main actors: Koshiro Shimada, Kai Hasegawa, Takuro Ohno, Daisuke Takahashi / Main singer: Kai Hasegawa)
(Maybe you should start a separate thread about Hyoen 2024? Nothing has ended here - it's going to cinemas and there will be DVDs, apparently. Or, should there be one thread for whole Hyoen series for not to repeat general information?... What do the admins say?)
There was a separate thread at first, which was then merged back to this one to avoid interrupting the flow of conversation, which I'm ok with. Unfortunately I don't think there will be a DVD release (as we didn't get one for any of the previous Hyoen productions), so after the cinema screening, which just ended, there's only the tv-broadcast of the possibly re-edited version at the end of January left. I assume that the news will then shift entirely to the new production.
A general Hyoen thread would be a possibility, although this could lead to getting too chaotic and news about the new production getting buried...