The original name of the song is "ハラハラ" (can be abbreviated as hrhr).

This song was produced by Mr. N station up owner (Riche りマンキーコング). Weapon A uses songs from the Cthulhu system mythology to heighten the terrifying atmosphere.

Yinmad is the originator of ghosts and beasts. The most famous work is Blue Road. Nowadays, the common Yinmad material is Soka Gakkai. Weapon A is also made of Soka material in a sense.