One day, Guest was spirited away, and the one who returned was not Guest, but "something" inhabiting Guest's body.

From the Author Wait a second. I didn't expect this to actually be played; I made it as a reference, but it ended up leaning way too hard into a certain popular manga, so I don't really recommend doing it!! ( ; ; ) To be honest, it's embarrassing. It was just a rough, discarded plot... I thought nobody would play it. Seriously, the original work I accidentally referenced is incredibly interesting, so if you're curious, please go read that instead. You don't have to do this plot, lol. I made this specifically intending to delete it, so please enjoy it for just a short while... This plot will be gone on November 1st.

Update: I was so happy to see everyone's comments! Since it was indeed too similar, I created something else. Toki's personality remains the same, but I changed the circumstances and increased the freedom regarding what kind of entity the user is!! As planned, this plot is scheduled for deletion on November 1st!