![1girl absurdres ass back bluecup breasts falling_petals fingernails genderswap genderswap_(mtf) highres kibutsuji_muzan kimetsu_no_yaiba large_breasts long_hair looking_up nude open_mouth outstretched_arms sharp_fingernails sideboob white_hair rating:q score:15 post #3885608](/cdn_image/preview/2e/01/2e019fe27c7c90c3ce821dca910b9c60.jpg)
This tag is a subset of the genderswap tag, and it indicates which kind of change it is, namely male-to-female (mtf). The spear counterpart to this tag is genderswap (ftm), i.e. female-to-male, which can be used in conjunction with this tag to indicate that both changes are present.
Note: Please be aware that the "女体化" tag may also on occasion be used to describe female personification, rather than a genderswap.
This tag implicates genderswap (learn more).