After learning about the unsolved probability case file #666, that measures the possibility of The Children become villains or not in the future, Minamoto and the girls end up trapped in an esper-proof safe along Muscle and Mio. Upon learning that they had fallen in a trap set by the Normal People, Minamoto makes use of his ingenuity to have Kaoru and the others activate their limiters' newest feature, the "Triple Boost", that allows them to combine their powers to increase the ability of one of them allowing them to escape.