The peculiar site 1d4chan.org hosts this fan-created implementation of the To Aru universe. The rules feature psychic powers and magic. The system uses a "roll-under" system with d10s.
The setting is extracted from A Certain Magical Index.
A Certain Magical Index (とある魔術の禁書目録 Toaru Majutsu no Indekkusu) is a Japanese light novel series written by Kazuma Kamachi and illustrated by Kiyotaka Haimura, which has been published by ASCII Media Works under their Dengeki Bunko imprint since April 2004.