This is misc:"body swap", it's not male:"gender bender" or female:"body swap". Tag definition body swap: "Should not be tagged as gender bender even if the person swaps with someone of a different gender. ... If the swap is between participants of the same gender use that respective namespace, otherwise use misc:body swap."
@danielwain I could be wrong, but I'm actually not sure that's correct. Male gender bender definitely applies when one of the 2 characters is canonically someone born male but is now in a body that specifically fits female tags. And since he and the girl he swaps with both spend the entire chapter in a body type that specifically fits the female tags, I think this would be a female body swap, not misc.
I suspect this type of story might be kind of a gray area, where the exact correct tags might be a matter of personal opinion? Most GB stuff is a lot more cut and dry than this. lol
@danielwain male:"gender bender" has a general definition like what The Goat is Watching has said. Now, as for tags like "body swap", they're more like supplementals, indicating the way in which the gender bender occurred. Other examples are feminisation (through drugs/magic), body suit, possession, etc. All of these still warrant the "gender bender" tag.
And if that doesn't satisfy you, consider that the work has the Gender Bender tag on DLSite (性転換(TS)), so does basically every single thing published by this artist (I oughta know, I bought most of them). If the artist says it's GB, it's reasonable to tag it as GB here.