It washed up along with numerous other items and thing from other peoples worlds last year. From what I've gathered, it's from Nagito and Hinata's world.

[Kanaya opens up the bag of stuffing and pulls a large clump of fluff out to hand to Takeru.]

If you are interested in literature from my world, I donated my collection of books that washed up to the library. I kept my sewing machine though, as you can see.

[I hope you two like Troll!Twilight, as she has the whole series. There's a few outliers sure, but it's mostly rainbowdrinker(alternian vampire) novels.]