Maniacal Book appears on the later floors of the Arqa Block within Tartarus, from Floor 48 and upwards. When defeated, it may drop Amethyst gemstones.
Maniacal Book appears in Paradise 2 through 4 in Heaven inside the Midnight Channel. When defeated, it may drop the Crimson Cover material. Selling 4 Crimson Covers at Daidara will unlock the Vampire Shoes in the shop's inventory for Chie.
In Golden, it appears in the same locations, and it may drop Buffalo Stone for trade at Shiroku Pub.
Persona Q2: New Cinema Labyrinth
Maniacal Book appears in Acts 1 and 3 of Hikari. It attacks with Electric skills, and may cast Confusion on the party. When defeated, it may drop Book Gem and Book Cover. Book Gem is used to create the David for Morgana, the Bus Stop Sign for Shinjiro, the Hydravenom Bow for Yukari, the Chrome Heart for Naoto, and the Crusader Plate male armor. Book Cover is used to create the Kijintou for Yusuke, and the Trident for Ken.