In addition, Saito runs a YouTube channel offering advice on how to improve artwork and published several books based on its content.

[7] He provided the illustrations for collaboration merchandise between Monster Hunter Frontier and Hatsune Miku, celebrating the 10th anniversary of both franchises.

[8] Saito provided the character design for the manga series Suginami Tōbatsu Kōmuin, which began serialization in Shōnen Jump+ in 2018.

[14] In October 2019, he provided illustrations for Hatsune Miku mug cups that were sold in Sega arcade machines.

[17] In the same year, Saito released his first advice book, Umaku Kaku no Kinshi: Tsurakunai Irasuto Jōtatsu-hō, on March 22, with contents based on his YouTube channel.