English name: Ten thousand ways to win sexy guys's hearts. (via manganato)
There are 2 chloroform scenes. The first one (first 2 panels) begins with a guy chloroforms the main female but she's able to fight back. The second one happens in the next chapter, this time she is chloroformed by a female villain and goes unconscious.
English site: https://readmanganato.com/manga-je986539/chapter-15