Numerous

"-I kill Zeke by accident but when I try to resurrect him, Ymir pops out!" he glances at the pouting girl, "Not that I'm complaining..."

"Uuh huh..." Tiffania ers, "And what did you do to Marley? This 'Empire' which resembled the Nazis from your own world?"

Michael plans the back of his neck, "About that... Ymir here decided that she'd had enough and destroyed them..." he states while sending a silent apology to the now pouting girl.

"Is that true...?" she asks, locking eyes with Ymir as the 'young' girl nods.

"Ah, did I mention she can't speak? Or write?..."

"Don't you have a spell to link minds?" Tiffania questions.

"Yeah but it didn't work. Anything that she could even attempt to communicate with, be it writing, word cards, or telepathy simply doesn't work... Has something to do with her divinity I think." he shrugs, inwardly fist-pumping for the tangent. "Anyway, I'd actually like to hear what Saeko and Megumin got up to while I was busy?" he asks, only now looking at them and seeing them slouching on the couch with tubs of ice cream...

Ymir sees this at the same time of course and walks over while pointing at the treats with curiosity. Megumin shuffles over to make room and feeds the girl a mouthful, causing her face to light up as if all of her dreams had come true simultaneously.

Tiffania's eyes soften at this but she composes herself enough to ask, "So, you brought a genocidal god into our home...?"

"Er? Yeah? You can't say Marley didn't deserve it? I mean, compared to the Nazis these guys were probably worse! If they started running low on Eldians to become Titan Shifters they'd forcefully 'breed' them. And that's forgetting the fact that they were literally turning people into giant cannibalistic monsters to terrorize their former friends and families..." Michael says and shakes his head before continuing,

"It wasn't just the Eldians either, when I was loot-*Ahem*, searching through their offices, I found plans of subjugating other countries with similar means. They wanted to wipe out all the Eldians but their own to use them as weapons against everyone else after coming up with a reason to discriminate against them."

...

"You did it, didn't you Michael?" Tiffania asks, knowing after his 'speech' that if Ymir hadn't destroyed them, Michael would have. After all, he'd killed many more people for much less.

He wets his lips, "Yeah, fine, I did, and I'd do it again if I had the chance." he admits and Tiffania's face falls.

"And the innocents in Marley?"

"Collateral. If it makes you feel any better, I didn't steal most of their souls, and those I did are sitting comfortably in my realm." he shrugs.

...

"How many...?"

Michael quirks a brow, having not considered it. He glances to Ymir who stabs her spoon in her ice cream and begins signing numbers.

1-1's. 8-0's.

100,000,000

"One hundred million..." Tiffania mouths with a trembling hand, she gets to her feet but stumbles slightly and has to be escorted out by Maria, who also looks horrified by the number. Illococoo and Charlotte stay put but even the latter was appalled by the number, even while controlled by Clavicus Vile she'd not come anywhere near a thousand, let alone one hundred million...

Michael lets out a sigh and flops onto the beanbag next to the dragon girl, "What's the big deal? They were going to die eventually, I just sped the process up."

"That's not the problem and you know it," Saeko drawls, "While I don't care, they do, and Tiffania asked you not to in the past. Why wouldn't you just lie about it." she states.

"I don't know, I reckon it would have come out eventually anyway. If it helps, I think they deserved it too." Megumin adds before changing the subject, "Can we hear what you did now Saeko? I want to hear how you picked up that Mikasa girl."

"Yes, let's just ignore Tiff having a panic attack and move on like nothing happened." she huffs, "I'll tell you after Michael goes to check on her." she all but demands despite spoon-feeding Ymir yet more ice cream...

...

"You're right, I know you're right but it feels shit to be wrong... Even if I still think I'm right." he mutters as he gets up for the Nth time, Illococoo letting out an irritated noise as moves her and heads for the door.

"Are you sure that's a good idea? She did just hear about you killing an entire country of people..." Megumin questions.

He shrugs, "Not like it's anything new, the Middle East looks more like the 'Eastern-Sinkhole' nowadays."

With a click he exits the room, leaving the group just silently sitting there.

...

"Say, anyone feel like watching 'Transformers'? Those giants kind of remind me of them." Megumin asks.

------------------------------------

Michael tracks Tiffania down to the local Orphanage and finds her quietly sitting on a bench that overlooked some orphans playing in a makeshift sandpit. She spots him and looks ready to move again when he speaks up, "Tiff, I'm sorry-"

"You're not sorry... I know you're not, otherwise you wouldn't have done it. I know you're struggling with emotions right now but you still know the difference between soldiers and civilians..." she quietly says, her voice rough from suppressed sobs.

...

He gives a slow nod, "I know, I'm not sorry for what I did, but I'm sorry for hurting you... Again..." he scratches the back of his head, "Can we just sit down and talk about this? It isn't like I didn't have my reasons for doing it. We did basically the same thing back in Cendri-"

Tiffania clenches her jaw, "T-that's not the same!"

"Isn't it? That fire killed entire families, and we were both responsible for it. It was revenge, cold and clear. So, it is the fact that I did it that's the problem or just the number of people affected?"