Psycho Logical

Tomo Kunagisa leaves her apartment for once, dragging Ii-chan along, to break a former member of her old hacker group, Gaisuke Utsurigi, out of an isolated research facility run by the scientist Kyouichirou Shadou. Behind the facility's walls, the visitors meet a staff of eccentric researchers and a man whose very presence unsettles Ii-chan's habit of talking his way through everything. (Source: NISIOISIN Wiki)

Psycho Logical was collected in 2 volumes. Psycho Logical (Part One): Gaisuke Utsurigi's Nonsense Killer (Original: Saiko Rojikaru (Jō): Utsurigi Gaisuke no Zaregoto Goroshi) and Psycho Logical (Part Two): Sour Little Song (Original: Saiko Rojikaru (Ge): Hikaremono no Kōta) are the fourth the fifth novel of the Zaregoto Series, written by Nisio Isin and illustrated by Take. It was originally released on November 5, 2002 in Japanese.