I think ML always accidentally killed the guides he has been with. I bet he tried to find a guide that fit him that could handle him, but so far, he find none. And I think MC partner is death because he went to SS-class dungeon before. The side effects like he said is making the esper slowly go crazy and then going rampage. MC might known about SS-class dungeon better than he let on. ML said that I can't be that MC partner, assuming that he was an S-class Esper, losing control over his power. But he didn't know the possibility that MC's partner might have been to the SS-Class dungeon. Because like he said, nobody ever getting out of there alive. I had a theory that MC's partner and our ML now is at least know each other in the past.
Okay is this hinted that they both murdered or accidentally killed their partners? did the ML Kill his last guide or was he just injured from overexertion? I’m so conflicted on this story it feels off putting I don’t know how to explain it but I have a feelings it’s gonna do downwards FAST