Academy City is hosting the Grand Champion Star Festival, a sports competition between the various schools of the city, during which visitors from outside the city are allowed entry. Whilst T?ma's parents, T?ya and Shiina, as well as Misuzu, a relative of Mikoto's, get to know each other, T?ma and Mikoto decide to make a bet in which the loser does anything the winner wants. Meanwhile, Laura contacts Aleister to inform him that magicians have infiltrated Academy City in order to make a transaction with a magical weapon called the Stab Sword, which has the power to kill a Saint. Meanwhile, T?ma has several troubles with a hungry Index and awkward situations with the class representative, Seiri Fukiyose. Later, T?ma runs into Stiyl and Tsuchimikado, who tell him about the intruding magicians and asks him not to get Index involved. Whilst getting scolded by Seiri after an awkward incident with Index and Komoe, T?ma runs into a woman named Oriana Thomson. When his Imagine Breaker reacts to her, he realizes she is one of the magicians in question and starts to follow her.
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