During a fight, Tatsumaki and Saitama end up entering a black dome, which transports them to another world where only one city remains standing. They will search for a way back by entering domes known as cavities.
This story takes place shortly after Saitama defeats Void.
Saitama was in his apartment, provided by the Hero Association, playing video games since he had nothing better to do. Suddenly, he heard a knock at his door. He ignored it and continued playing, but then someone started yelling at him.
"Hey baldy, I know you're here, so come out. We have some scores to settle."
Upon hearing this, Saitama became annoyed and got up to see who it was. He saw Tatsumaki glaring at him.
Saitama: "It's you again, kid."
Tatsumaki: "Hey, I've already told you I'm not a kid, so show some respect."
Saitama: "Yeah, well, what do you want?"
Tatsumaki (annoyed): "What do you mean, what do I want? I've come to settle the score from our last fight. So let's go outside. This time I'll crush you."
Saitama (annoyed): I don't want to, go bother someone else. I'm busy with other things.
So Saitama closed the door on her and went back to playing video games. Outside, Tatsumaki radiated pure hatred, a vein throbbing on her forehead at the bald man's behavior. Using her power, she destroyed the door and stormed inside.
Saitama: What the heck? Hey, brat, what's wrong with you? You destroyed my door!
Tatsumaki: That's the least of my worries. We'd better go somewhere else to fight. Unless you want me to destroy you and the apartment.
Saitama: Seriously? All this fuss over a fight? Fine, let's go. I don't want you destroying my house. I'll teach you a lesson in manners, brat.
Tatsumaki: We'll see about that, baldy.
Before leaving, Saitama put on his hero costume and then went out with Tatsumaki, following her until they reached a large clearing among cliffs far from the headquarters.
Oops! This image does not follow our content guidelines. To continue publishing, please remove it or upload a different image.
Tatsumaki: This is fine, we're far enough away from distractions, so get ready, baldy, I'll defeat you.
Saitama, indifferent: Yeah, yeah, hey, can we start? I want to finish this quickly so I can get back to my video game.
Without further ado, Tatsumaki launched her first attack, causing two rocks to erupt from the ground to crush him between them. Saitama moved quickly, but noticed that some rocks were heading straight for his head. He managed to dodge them by moving his head. But as he did so, Tatsumaki used her powers to send a section of earth where Saitama was standing flying upwards, taking Saitama with it (Tatsumaki knew she couldn't directly affect the bald man, but she could affect him indirectly). Already airborne, Tatsumaki hurled more rocks at the bald man. Saitama, still airborne, began dodging the stones hurtling toward him, but suddenly a large boulder crashed down from above. Saitama used the rock to his advantage, landing and leaping toward the cliff. Upon reaching it, he began running along the edge. As more rocks slammed into the cliff face, it was clear that the stones followed him, but they only managed to hit the cliff wall, which was beginning to crumble under the force of the impacts. Meanwhile, Tatsumaki remained suspended in the air, observing everything.
Tatsumaki: Stop running, baldy.
At that moment, Saitama jumped and stood in front of Tatsumaki.
Saitama: Hey, be careful where you throw those rocks. Besides, I'll finish this soon.
Tatsumaki was surprised, but quickly recovered and smiled. Seeing this, the bald man was confused, but without him noticing, a large rock appeared. The bald man was taken by surprise and couldn't dodge; he was hit and sent crashing to the ground with a loud bang, but Saitama got up as if nothing had happened.
Saitama: What? Where did that rock come from?
He tried to see Tatsumaki, but the impact created a huge cloud of dust. He was about to brush it aside, but before he could do anything, Tatsumaki grabbed his head.
Tatsumaki: I've got you, baldy.
Without further ado, Tatsumak would drag Saitama at high speed against the ground, and then against the cliffs.
Oops! This image does not follow our content guidelines. To continue publishing, please remove it or upload a different image.
Tatsumaki: That last rock caught you by surprise, didn't it, baldy? Heh, you know, she had to bring it from space since you could react to the ones she was throwing at you from around you. So she kept it hidden, waiting for the right moment, and when you got close, it was the right moment.
The little woman said this while continuing to drag him by the head and slamming him.
Saitama: Seriously? By the head again? If you keep doing that, I'll never grow hair.
Tatsumaki: Shut up, baldy. It wasn't going to grow anyway.
After saying that, Tatsumaki saw a large rock in the middle of the cliffs, so she increased her speed to hit the bald man with it.
Tatsumaki: Take this, baldy.
But before the bald man could be struck by the large rock, a black dome appeared in front of him. Appearing suddenly and at the incredible speed they were traveling, Tatsumaki couldn't avoid it, and she and the bald man ended up entering it. As soon as they entered the dome, it vanished along with the two heroes.
Once inside, they could only see a multitude of colors flash before being plunged into complete darkness. They remained like this for a moment, until everything went white, briefly blinding them. Afterward, their vision returned to normal. They could only see that they were floating in the air.
Tatsumaki: What was that? Where are we?...
Saitama: Hey, could you let go of me? It's getting annoying that you're holding my head.
Upon hearing this, Tatsumaki realized she was still holding the bald man. Without another word, she let go, sending them plummeting from the heights. Saitama crashed to the ground, kicking up a small cloud of dust that quickly settled, revealing him standing in the middle of a small crater. He began brushing himself off, and Tatsumaki followed him down.
Saitama: Hey, you should have put me down first.
Tatsumaki: You wanted me to let go, and I did, so don't complain.
Saitama: Yeah, well, we're done playing, so I'm leaving.
Tatsumaki: Hey, baldy, wait. Don't you see something different?
Saitama: Hmm, I don't see anything different.
Tatsumaki: Pay attention, baldy, we're in a different place.
Saitama: I see it the same, the cliffs and the desert.
Tatsumaki: Seriously, you don't notice anything, not even that strange energy in the air?
Saitama: No, I don't feel it, but now that I look closely, there are crystals everywhere.
Tatsumaki: Finally, you notice them, baldy. I wonder where that dome took us?
Saitama: I don't know, but hey, look over there, there's a village. Let's go and ask where we are.
Tatsumaki: Finally, you say something useful.
With that, she flies off, while Saitama runs toward the village.