Leetspeak Monsters released their first single "Monster's Party" with label GLK Music in 2017, following band leader D13's concept of creating a "crossover of rock and hip hop within the imagery of a haunted house." In the same year, the band released a mini-album
Storyteller in the Strange Night, followed by their first full-length album ''Monster's Theater,'' which ranked in the top 100 on the
Oricon album chart. The band's subsequent releases continued to expand the mythology of Leetspeak Monsters' fictional home of "Gravetown", with lyrics in English and Japanese about normal people having scary encounters. In 2018, Leetspeak Monsters released the mini-album
Mixtured night between Life and Death and a single covering
The Nightmare Before Christmas theme song "
This is Halloween", resulting from D13's admiration of filmmaker
Tim Burton and composer
Danny Elfman. On May 26, 2018, Leetspeak Monsters began their one-man tour of Japan called "Leetspeak monsters 1st Oneman Tour Life and Death Tour - Seija to sisya no yoru". The tour went across 3 cities with the final performance at Takadanobaba CLUB PHASE on June 3. In 2019, the band released the maxi-single
13th Friday Night and their second full album ''Monster's Theater II.
They also contributed an original song, "Gekkouin -Moonlight Shadow", to the album Bad Ass Temple Funky Sounds
from seiyuu rap project Hypnosis Mic''. In 2020, Leetspeak Monsters released the maxi-single "Beltane", named after the
Gaelic bonfire ritual. == Band members ==