Judging from hairstyle, hair color, eye color and skin tone it looks more like a full on body swap instead of just Rulerchi dressed in Chevachi's clothes. Also the "in", which is usually how bodyswaps/personality swaps are indicated.

Not going to change the tags yet though, waiting for second opinions.

NNescio said in comment #2607694:

Judging from hairstyle, hair color, eye color and skin tone it looks more like a full on body swap instead of just Rulerchi dressed in Chevachi's clothes. Also the "in", which is usually how bodyswaps/personality swaps are indicated.

Not going to change the tags yet though, waiting for second opinions.

https://x.com/mikaduki5/status/2066433752579166252
If the translation's correct, then its possession.