For natsuki.jfif
It actualy in Photoshop:
1. Invert color.
2. Filter -> Distortions -> Polar coordinates -> Rectengular to Polar (I use different language local, so dont how it's be in English)
And its ended like this:
https://filetrip.net/view?89r6NzVl52
@Xdqwerty, Osu! Tatakae! Ouendan! is the Japanese version of the game, different settings/characters/songs but otherwise identical mechanics. I played that before I knew about Elite Beat Agents lol. Both fantastic games https://en.wikipedia.org/wiki/Osu!_Tatakae!_Ouendan