Ha, that's a cool story. Does it have any relation to the Jinmenso? The part about the worm expelling from the anus and being killed then reminds me of the common folk remedy/joke regarding the t...
https://hyakumonogatari.com/2013/11/18/oseichu-the-mimicking-roundworm/#comment-7163
This is a Japanese version of the internationally distributed legend type often classified under the title "The Bosom Serpent" (after Nathaniel Hawthorne's 1834 short story that makes use of the ...
https://hyakumonogatari.com/2013/11/18/oseichu-the-mimicking-roundworm/#comment-5629
Yuck! :)
https://hyakumonogatari.com/2013/11/18/oseichu-the-mimicking-roundworm/#comment-5628
Kind of reminds of the Futakuchi-onna will that it's a parasitic mouth demanding food
https://hyakumonogatari.com/2013/11/18/oseichu-the-mimicking-roundworm/#comment-5624