ゲザン家の娘キザンちゃん実は泳げます
↑でも結構練習したらしいよ っていうアニメ (それだけ
Xに投稿した方はなんか海外にデルタルーンのネタ？で凄い弄られたんで消しました鬱

Kizan-chan, the daughter of the Gezan family, can actually swim!
↑ That's the gist of the anime, which apparently took a lot of practice to make (that's it).
The person who posted it on X deleted it because they got heavily teased/panned internationally over some Deltarune reference or joke, and now they're depressed.