A Certain Magical Index IF: Spiral of Checkmate

This is the story of a world where Kamijou Touma did not make 'that choice.' At a certain intersection in Academy City, Kamijou Touma thrusts his right hand forward and shouts his usual cry of misfortune. Index, a girl in white nun's habit, trembles behind him. But in that instant, a small doubt arises in Touma's heart: 'Maybe she'd be happier if I returned her to where she belongs, instead of protecting her.' That single moment of hesitation changes the world. Index is taken back by the magic s