2011 September 7, Hideaki Sorachi, “特別訓 コラボにはエイリアンVSプレデターがあるのも覚えておけ [Special Lesson: Remember There Are Crossovers Like Alien vs. Predator]”, in 銀魂 [Silver Soul], volume 41 (fiction), Tokyo: Shueisha, →ISBN:
Ōi Minna yoku kikē Konkai no Gintama wa anime fukkatsu o shukushite bangaihen o yaru koto ni natta zo Sore ni atatte da Dōjiki ni anime ga hajimatta Suketto Dansu to korabo o shiro to no koto da
Alright! Listen up, everyone! This week, to celebrate the return of the Gintama anime, we’re doing an extra story. And it’ll be a crossover with the Sket Dance anime, which is starting at the same time.