Yuzhen found Index's relationship with her companions utterly baffling.
The English Puritan Church companions who had protected her all along, Kaori Kanzaki and Stiyl Magnus, had originally been Index's companions.
But because of Index's special circumstances, the upper ranks of the English Puritan Church reset the memory of this big-eating nun every year.
After the latest memory reset, due to a failure to communicate in time, they had not recognized each other. Instead, Index had mistaken them for villains after the knowledge contained in grimoires.
The misunderstanding that arose from this was never explained by her companions. Since her memory had to be reset every year anyway, there was little they could do whether she misunderstood them or not.
They could only pretend to be ill-intentioned magicians along the way while escorting Index to Academy City.
To make their villain act more convincing, Kaori Kanzaki and Stiyl Magnus would occasionally... genuinely attack Index.
The first reason those two could attack her without worry was that they held back.
The second was that the nun's habit Index wore was a spiritual item called the "Walking Church."
Once worn, this spiritual item could withstand a nuclear explosion.
But unfortunately, during her interaction with Touma Kamijo that morning, Index had refused to believe in Imagine Breaker's power and insisted that he touch the Walking Church...
The result was obvious.
The Walking Church, which could defend against attacks on the level of a nuclear bomb, had shattered all over the floor the moment Touma Kamijo's right hand touched it...
Later, Index had used safety pins to piece the Walking Church back together.
There was no need to elaborate on what followed. Unaware that the Walking Church had been damaged, Kaori Kanzaki casually swung her blade outside Touma Kamijo's dorm room, causing Index—wearing the shattered