Replica is first seen in Chapter 1, after Yūma is hit by a car. When Yūma was asked where he lived, Replica gave him the address. He then says that if he keeps getting hurt like that, his body will be severely damaged, and Yūma tells him that if he worries too much, that'll happen again. Replica then tells Yūma he's 25 minuts late for school, to which Yūma replies in disbelief, saying it's impossible. Yūma then asks Replica if he can use his trigger, which Replica denies, saying he's the one who decides when Yūma can use his Trigger. Yūma then says he's gonna leave, and Replica says he should be careful what he says. Later, when the Bamster attacks the bullies that were bullying Yūma and Osamu, Yūma asks again if he can use his Trigger. Replica allowed, again saying he's the one who decide