Sekai de Ichiban Tsuyoku Naritai! Specials
SekaTsuyo Specials
Wanna Be The Strongest in the World Specials
世界でいちばん強くなりたい!
Short specials included on the BD/DVD volumes of "Sekai de Ichiban Tsuyoku Naritai!"
Short specials included on the BD/DVD volumes of "Sekai de Ichiban Tsuyoku Naritai!"