Unlike a standard PDF, which is a static image of a page, an Epub is a responsive, reflowable format. The "Epub Exclusive" of Muneca Rusa reportedly includes:

The Russian doll, or "matryoshka," is a type of wooden toy that consists of multiple, hollow figures of varying sizes that fit inside one another. The doll's design typically features a female figure, and the number of nested dolls can range from two to twenty or more. The matryoshka is often decorated with vibrant, floral patterns and other ornaments that reflect Russian art and culture.

Inside, she found a note: "The power to break the cycle lies within. Change your perspective; change your world."