So earlier in the latest arc, Momo (the female MC) ends up getting shrunken and pulled into a cursed board game. Eventually the board game is destroyed and she manages to escape but she didn't grow back to normal yet (it seems the next big plot goal will be returning her to her normal size). The image is from 163.
There is a lot of cute shrunken women shots in the newest Chapter, 166, which you can read the official release chapter for free here
https://mangaplus.shueisha.co.jp/viewer/1022094