Nolan is having an ordinary evening when his son Mark quietly comes through the front door, wanting to talk to him discreetly. The men head to Nolan's office, where Mark tells his father that he's in a relationship. A serious one. He also reveals that she's not American, but a foreigner.
Nolan: "Well, don't just leave her out there son, tell her to come inside. It's cold out and..."
Mark: "Dad, she's right outside the window."
Nolan: *looks and finds a little girl floating in a energy field, watching him suspiciously. He turns back to Mark and puts his head in his hands* "Son, listen. I know you're at that age but come on! Where did you find this kid, grade school!?"
Mark: "Dad stop! You'll piss her off..." *runs to the window* "TATSU-CHAN! Please don't be mad! Dad can be insensitive sometimes but that's how he he cares about people!"
Tatsumaki: "OKAY FINE! By the way this is my real age!"
Nolan: *finds the number 28 carved on his body with what looks like an invisible blade, along with Tatsumaki's entire resume* "An older woman, and the world's second-ranked hero too? I'm proud of you, son!"
Several days later, it turns out that even though Mark thinks Tatsu-chan is a bit tsundere, she's actually a YANDERE!
What happens to the Invincible universe now that Tatsumaki is Mark's yandere girlfriend?