When a boy into UFOs collides with a girl into ghosts, the universe will never be the same! Dandadan (ダンダダン) is a Japanese manga series written and illustrated by Yukinobu Tatsu since April 2021.
In Chapter 83, Momo Ayase, the female protagonist, finds herself locked inside the restaurant where she works. The customers and other waitresses transform into clones of an alien resembling This Man.
Here in the Shōnen Jump+ website: https://shonenjumpplus.com/episode/316190246979647880
Here Dandadan wiki: https://dandadan.fandom.com/wiki/Volumes_%26_Chapters
Dandadan is translated into various countries.