This is just a guess tho. But masato's wish is not to be alone while nishijima's is maybe for a lover who love him wholely.. And when they met they both thought their wish was granted but the two devils said something about two contractors cannot meddle (not sure something like that) therefore their wishes is not granted yet.. The reason why nishijima changed his attitude is maybe because he found out masato like togou therefore masato cannot be the one he wished fpr which is a lover thas why he asked if his wish needs a higher price or something.. Or maybe nishijima likes masato since they were classmates before and is just jealous of togou hahahah this are just my guess tho
Can someone explain to me what just happened... im so confused for some reason ╮( ̄▽ ̄)╭