References
Ishida, Sui. “Tokyo Ghoul.” Tokyo Ghoul, vol. 1, Viz Media, 2011.
Ishida, Sui. “Tokyo Ghoul.” Tokyo Ghoul :re, vol. 16, Viz Media, 2014.
Weiss, Michael. “How Can a Mug and a Torus Be Equivalent If the Mug Is Chiral?” Mathematics Stack Exchange, 1 Jan. 1967,
math.stackexchange.com/questions/2258389/how-can-a-mug-and-a-torus-be-equivalent-if-the-mug-is-chiral.