[cubicjack]

Summary for radio drama:

Spoiler for radio drama:

Index side:
Touma, Index and Mikoto were eating in a restaurant. Afterwards, Mikoto needs to go back to her dorm and they split up.
Then, Index and Touma bumped into Terunoa, a girl wearing a St. Andrew's cross who claims to be a ex-magician who sneaked into Academy City. Terunoa's throat was injured and can only speak properly with the help of a device (I don't really know what those devices are called in English), and as such, she cannot chant magical spells.

While they were chatting, Touma received a call from Tsuchimikado saying that a magician sneaked into AC and activated a large earthquake spell that would destroy the whole city.

Naturally, Touma suspected Terunoa, but she defended herself by saying that she couldn't have activated such a large spell when she couldn't chant, and that she wouldn't activate an earthquake spell that would destroy the place she is currently in and kill herself.

However, there are spells that can be activated with sounds other than vocal chants (such as using sound from musical instruments). Also, Terunoa's St. Andrew's cross can act as a defense against that spell. Index noticed those and Terunoa admitted that she's the culprit. It turns out that she made use of the environmental noise in AC to activate the spell. They fought and Touma won.

Terunoa wanted to destroy AC because she's mad at the science side for denying magic and their efforts. Index guessed that Terunoa heard about the Imagine Breaker ability, but doesn't know exactly what it is and who has it, therefore decided to just destroy the whole city.

Railgun side:
After leaving the restaurant, Mikoto got a call from Kuroko saying that there's gonna be a surprise room check at the dorm, then she split up with Touma and Index and rushed back to her dorm.

After arriving at the dorm, it seems that the info was false and there is no surprise check. After electrifying Kuroko for disturbing her plans, Usukinu Yasumi, a first year girl, approached Mikoto and wanted to fight with her.

Usukinu calles her ability (she calls it "Side Arm", but the real name appears to be "Insulation"), and that ability can interfere with electric attacks. Because of that, Mikoto's attacks can't hit her (although Mikoto didn't go full power). With the dorm supervisor almost catching them, Mikoto decided to run away and hide from her to prevent more trouble.

After some investigating by Kuroko, it was revealed that Usukinu's ability is a Lv. 3 Telekinesis, but her ability also has the effect of deflecting electrical fields.

While outside, Usukinu found the hiding Mikoto by coincidence. Soon after, there was a huge lightning strike and an earthquake (both are the effects of Terunoa's spell), and Usukinu thought that it was Mikoto who caused the lightning and earthquake and was freaked out. Because of the earthquake, a sign was about to fall on Usukinu. Mikoto used her Railgun and blew the sign away despite Usukinu's Side Arm ability still in effect.

After the earthquake stopped, Usukinu said there's no need to fight anymore, since Mikoto already used her strongest move. Kuroko called Mikoto, saying that Usukinu probably fought Mikoto because of a rumor saying that "whoever can get Mikoto to use her full power, that person's love for her will blossom". It turns out that Usukinu was the same kind of person as Kuroko.