“…” Index stared at the card with distrust. Something was happening. Kamijou had surely gone alone to deal with something.

Index recalled that a few days ago, she had met the feeling-less teenager. Despair and anxiety caused Index restlessness.

Run. She could only run.

Luckily, with the knowledge of 103,000 grimoires, she understood the workings of Stiyl’s magic. The runes required the magician to continuously provide mana to maintain it.

For example, when a soul is lost, a thin string-like something would link the soul and body. Though Index could not use magic, she could trace the mana to prevent from getting lost.

And, like that, Index ran off for the battlefield while neglecting to even lock the door.

[...]

“Hm. So it’s over here?” As orange sunset melded with purple night, Index arrived before Misawa Cram School, whose normalness made it seem strange. Index had tracked the owner of the runes stuck to the student dormitory. However, it seemed the mana trail disappeared once it entered the building.



Toaru Majutsu no Index vol.2 ch.2 pt.9, ch.3 pt.1