This Armor is the second studio album recorded by Japanese singer-songwriter Chihiro Onitsuka, released in March 2002. It features two lead singles "infection", "Ryūseigun", and remake versions of "Allow of Pain" (B-Side of a single "Gekko" in 2000) and "Little Beat Rifle" (double A-Side to "infection").Onitsuka described the album as "a sequel to Insomnia", her chart-topping debut which came out in 2001.