ARM is the psuedonym for one of the lead members of IOSYS. With IOSYS, he has worked on over 700 arrangements, writing both composition and music, including some of IOSYS' best-known works such as “Marisa Stole the Precious Thing”. Much of his music fits into the so-called Denpa song/Moe Song category.
The most popular song by ARM (IOSYS)'s is ラストオカルティズム ~ 現し世の秘術師 (Last Occultism ~ Esotericist of the Present World)
ARM (IOSYS)'s first song ラストオカルティズム ~ 現し世の秘術師 (Last Occultism ~ Esotericist of the Present World) released on Fri Dec 29 2017.