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I am not too familiar with the song that Axel and the other members are covering but there's just one spot free, right?
I think he is intentionally making it a secret because the cover is not even 24 hours away from now and we still don't know. While I like Risu, Zeta or whoever it can be, I feel like it would be a bit underwhelming that is just one of them and not this super special guest after teasing this cover for so long, you know? I am still hyped for the song though, having this many people on it is really cool.