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Index's first meeting with Touma. Pretty much all of it.
The following gems from Chapter 7:
Touma's ignorance of Christian denominations and Index's attempt to explain them.
After I spend about half an hour attempting to elucidate to Touma exactly how the (admittedly vast and often confusing) variety of Christian denominations are organized, we both decide that the whole thing is rather more complicated than it ought to be, and look for a different subject to discuss.
Index explaining the importance of materials:
"...no good magician would be caught dead without a very large bundle of telephone cables."