When this animation was posted on Reddit there was some discussion in the comments about whether AI was involved in the creation. After some digging, I personally think this is a normal rotoscope:
In the comments someone asked what software was used to create this. They replied that Clip Studio Paint was used.
There are some samples on their Twitter page showing practice pieces with rotoscoping. Tweet and Tweet
Stepping through the animation frame-by-frame: You can see that while the individual images are rough sketches, the lines are sharp with no visible telltale AI artifacts. The kessoku band logo is clear and consistent and the way it jumps around looks to me that it has been manually edited into each frame. The same goes for her eyes. There is one frame around the 0:09 mark where her left hand looks a bit funky, but that looks more like an artistic error than an artifact. Too little to immediately disregard the entire work if you ask me.
This artist has worked with noka pi on the production of two animated music videos of singer Aimer who absolutely is a big name in the Japanese music industry. (A fairly recent song you might know is Sign which was OP2 of the 2024 version of Spice and Wolf) So this is an artist with a proper portfolio and connections. Tweet, Tweet
So I'm fairly confident that this is a normal rotoscoped animation. Still gonna pass it through the queue though.
Also just for completeness sake:
Song is Trouble by Haozi I tried to find the referenced animation but there is a literal metric fuckload of these dance videos, so I gave up after the first page.
