The Insulated World is the first album in 4 years since
Arche. Remixed and remastered version of two pre-release singles "Utafumi" () and "Ningen o Kaburu" () (with re-recorded vocals) are included exclusively for this release.
The Insulated World is available in three editions: regular edition, first press limited edition with a bonus CD and limited deluxe edition with a bonus CD as well as a bonus Blu-ray/DVD. The bonus CD in limited deluxe edition included new version of three old songs including "Kigan" (, from
Kisō), "The Deeper Vileness" (from
The Marrow of a Bone) and "Wake" (, from
Macabre) as well as live recordings of "Fukai" () "Ash" and "Beautiful Dirt", taken from performance at Shinkiba Studio Coast in
Kōtō, Tokyo,
Japan on June 30, 2018. The bonus CD in first press limited edition only included "Kigan" as well as live recordings of "Fukai" and "Beautiful Dirt". The bonus Blu-ray/DVD included live recordings taken from performances at Sendai Ginko Hall Izumity21 in
Sendai,
Miyagi Prefecture, Japan on April 28, 2018 and
Shinkiba Studio Coast in Kōtō, Tokyo, Japan on April 30, 2018 (additional show), respectively. ==Track listing==