The head of the English Puritan Church, Laura Stuart, has summoned the Index Librorum Prohibitorum with a mission to investigate the bombing of the Euro Tunnel that connects the UK with France. Index soon departs for the British Isles with her guardian Touma Kamijou in tow but their when their flight is suddenly hijacked by a mysterious figure, their plans will have to change! If they survive, Index and Touma's next unfortunate adventure will lead them to the heart of the UK!