Series mini-anime kỷ niệm được phát hành trên Kênh YouTube Kyoani trước Kobayashi-san Chi no Maid Dragon S.
Vietsub - HDHoàn tất (12/12) Slime Taoshite 300-nen, Shiranai Uchi ni Level Max ni NattemashitaI've Been Killing Slimes For 300 Years And Maxed Out My Level (Season 1)
Vietsub - HDHoàn tất (12/12) Shijou Saikyou no Daimaou, Murabito A ni Tensei suruThe Greatest Demon Lord Is Reborn as a Typical Nobody, The Greatest Maou is Reborned to Get Friends
