Psycho Logical(2002)

Psycho Logical

Tomo, Neon, Ii, Kyouichirou, Shito, Misachi, Kokoromi, Kasugai, Gaisuke, Jun, Kouta, Houko, Nanami Dead Blue (Tomo Kunagisa) ——is desperate!

"You actually hate Tomo Kunagisa, don't you?"
The genius engineer and former member of Tomo Kunagisa's Team, Gaisuke Utsurigi, is being held captive at a mysterious research facility—Kyouichirou Shadou (Mad Demon)'s Research Institute. Accompanied by her friend Ii—aka the Nonsense User, Iichan—are on their way to rescue Utsurigi, but are met with a horrifying "scene" that unfolds before their eyes. However, this "end" is only a taste of the "beginning" to come——!

(Source: Kodansha, translated)