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Summary
"Bonus. Mikoto's hairpin changed starting in Volume 6. There were signs starting in Volume 3, but by Volume 5 it was clearer than ever that she was in a position of a double heroine alongside Index. As such, I wanted to add something more feminine to her design, but Tokiwadai Middle School requires the uniform (no personal clothes allowed), so I chose a hairpin by process of elimination." ― Haimura Kiyotaka