>>2228713>>2228712orig is too small for /w/, but it's this one.
https://www.pixiv.net/en/artworks/66996341Appending uncropped instead.
Anyway, the resynthesizer is really cool. Just select what you want with the fuzzy select tool, grow the selection for a couple pixels, and have the plugin delete the selection (in this case, the chuuni text at the top-left and bottom-right).