Bundled with the limited edition packages of the manga's 12th, 13th, and 14th compiled volumes.
Based on a Japanese suspense manga series written and illustrated by Haro Aso. It was first serialized in Shogakukan's Shounen manga magazine Shounen Sunday S from November 2010 to March 2015, and later moved to Weekly Shounen Sunday, where it ran from April 2015 to March 2016. Its chapters were collected in 18 tankobon volumes.