Quick google on Ketsuman: "Ketsuman A portmanteau of the words ketsu and manko literally meaning “ass cunt,” this word usually describes the anus of an “passive” male"
Kinda decided not to open the links, was in public place.
Can be also a little play of words replacing "manko" with "manju" here, making it "ass manju".
Anyways seems too be sex slave yukkuris. Adding Marisa in the pic, this yukkuri shop seem to have an interesting profile.