TLN: Been thinking about this novel as well as “The World of Otome Games is Tough for Mobs,” but I don't think tackling three LNs at once is a good idea. I might choose to do one, the other, or maybe neither.
Sorry if the translation seems a bit stiff. This prologue uses some syntax more complex than I'm used to.

Memories of the former world circled around my head like a revolving lantern…wait, memories? It seems that I don't really have that many.

“You're one of those classmates that I don't recall. I don't remember you, but I do remember that I forgot about you. Maybe?”

“Damn it, are you serious. Since it's come to this, I'll have to unleash whatever trump cards I have towards you! People like you are incompetent!”

Killing me would be a waste of his precious casts, which have a usage limit, so understanding that well, it seems he's trying to figure out the minimal amount of casts necessary to kill me. Though it seemed that it was best to keep the invocations for powerful techniques up his sleeves in case of an emergency, he's already run out of options.

After all, neither he nor I play a leading part in this other world…yet even so, we're taking the place of our classmates. Since there's a valueless, nameless supporting role companion in the midst of the killings, yet acts like a protagonist, doesn't that indicate an error in the calculations? If the result of a calculation is wrong, then didn't the calculation process go wrong somewhere?

This is not the equation that will make him the strongest, this is the end, this is the solution.

“Goodbye. Whoever you are…”

He's continued to copy all kinds of skills by killing classmates while aiming for invincibility. As he raised hell, the effects of swung swords and fired magic attacks continued to tear and destroy my body, but even so, he was screamed all the while due to things not going as planned.

“Why! This is strange, this just isn't right. You should have died many times over by my calculations! Why don't you just dieeeee!”

In a world of swords and magic, mathematically-calculated, reliable attack skills create a high likelihood of a fatal blow, so him constructing a multi-attack was inevitable. Like I said though, it's pointless, as you've definitely made a miscalculation. Well, you're just unlucky.

“I have no need for your left-over shoddy skills, disappear! Stop kidding me!”

He had kept a grudge as he waited until he had enough skills to be 100% sure that he would kill me. He continued developing his futile attacks while utilizing his probability theories. It's fine even if I get hit by them all, as I won't die at the very least, meaning that I will be the one doing the killing.

His worries remain as he grows restless. His body manipulation cast does not go as planned and my legs keep moving, my body has already gone out of order since long ago. I've already lost my senses and my consciousness isn't working, you're not usually able to move such a tattered body in the first place, you know? So like I said, it's useless, but even so, he came raising a fuss while slashing his sword.

Judging by how he was looking at it, it seems he can't comprehend the stick of wood that I was raising overhead. His cheat-like sword equipment was broken, his prideful magic shield was tattered, and the magic he kept firing had no effect in killing me. Seeing me about to swing the wooden stick downwards made a display of how this incomprehensible world can go beyond calculations, and how it loses its meaning. This other world is always full of nonsense, so in that case, they certainly can deceive your calculations, right? Whoever you are.

While firing his deadly multi-attack skill towards me, he groaned “Guh,” in annoyance as he tried to destroy me. I only have shoddy skills which aren't worth stealing, and it seems he'll suffer a heavy loss of precious skills by trying to kill me. With this, he should lose that cheat technique which allows him to steal cheats from killed classmates, making it a big loss for him even if he killed someone again.

Everything from my left wrist and up was gone, my elbow was broken, left to dangle, my face also seemed half burnt to a crisp, and that technique just now cut off my feet, but even so, I kept walking and he opened his eyes wide while blankly starting, only letting out a mumble.

“You monster…”

It seems I became a monster in his eyes after becoming incomprehensible to him. He couldn't find any answers using his prideful calculation ability, which in other words means that he couldn't comprehend the meaning of the deceit going on.

For mathematical geniuses, a world where 1+1 doesn't always equal 2 will treat them like fools, and their probability theories will definitely fail. This is a world where the dice will roll an “M,” you see. Anything other than 100% can mean 0%, and at the same time, anything can happen if the probably is above 0.

Since he's a genius who can calculate an answer instantly, I just have to cut off his chances right from the get-go. Taking measures, I foiled his moves, unleashed my opening attack, watched out for traps, tricked him, deceived him. His chances turned into chaos by the middle stage, and made the foreseen outcome of the endgame simple. Then, his simple calculations on how to kill me no longer worked. I became a monster by the end, and his probability thinking ability was increasingly reaching its limits.

His calculations were infinitely increasing, and when he tried to solve them, his equations were breaking down, he reached a computational overflow. He's honing his sixth sense to conduct analogical reasoning. He cannot calculate the prediction for rolling a die that he doesn't know the contents of, he doesn't grasp the conditions for making 1+1 equal 2, he's making calculations without defining even one variable, resulting in a meaningless answer.

I then swung the wooden stick downwards, that was probably the only calculation you got right. Your HP turned to 0, your magic wall and cheat armor have lost their purpose, but it seems you haven't understood why.

Pretty unfair, isn't it?