Toaru Majutsu no Index Light Novel Volume 12 was first published on January 10, 2007. It is the first part of the two-novel storyline that occurs on September 30. As the first part of the story it mostly focuses on slice-and-life and comedic situations between the characters.
September 30 — the day where students in Academy City change into their Winter uniforms. Everything is in a hurry, while Tokiwadai Middle School's elite Level 5, Misaka Mikoto, is in front of a concert hall. She is waiting for someone.
However, "...He won't come."
"That guy" who should be in the punishment game can't be seen anywhere. Misaka heaves a sigh, carrying a flimsy schoolbag and a violin case in her arms as she waits.
When Kamijou Touma and Misaka Mikoto meet, the school-life (love) comedy about the punishment game shall begin!
- Prologue: Shirai Kuroko, Pillow, and Bed. Suffering_of_a_Negligee.
- Chapter 1: Sunny Morning Classes — Winter_Clothes.
- Chapter 2: What Kind of Penalty Game? — Pair_Contract.
- Chapter 3: Misaka and Misaka's Younger Sister — Sister_and_Sisters.
- Chapter 4: Gently Crossing Pairs — Boy_Meets_Girl(x2).
- Chapter 5: Sunset Unknowingly Passing By — Hard_Way,Hard_Luck.