Kaijuu Sekai Seifuku
Japanese title: かいじゅうせかいせいふく
Type: ONA
Source: Web manga
Episodes: 4
Status: Finished Airing
Aired: Apr 2, 2020 to Jun 20, 2023
Duration: 1 min per ep
Rating: G - All Ages
Genres: Slice of Life
Themes: Pets

Follows four dragon-like monsters who came to Earth to conquer it — but first, they study humanity by freeloading off an office worker in her 20s. They turn her apartment into their secret base, and prepare for their world conquest … eventually.

(Source: ANN)