Arisu is kidnapped by a stranger due to a trap set by a jealous coworker. With her legs spread wide and bound, she is forced into unimaginable humiliation. She experiences anal rape and double penetration, and after being given an enema, her body becomes intensely stimulated, causing her to uncontrollably release thick, messy liquid from her ass. Her body gradually changes as her anus becomes increasingly sensitive, developing into a source of pleasure. These experiences pave a new path for her.