Misaka Worst, Last Order and Accelerator sat in their large apartment together, watching TV. Then Kamijou Touma and Misaka Mikoto walk into the apartment, holding some groceries

Touma: “Yo, got the food for the anniversary.”

Accelerator: “Boutta damn time.”

Last Order: “I feel sleepy. Misaka says as Misaka yawns and falls asleep.”

Last Order yawns and falls asleep on Accelerator’s shoulder, and Misaka Worst looks at Accelerator with arrogance

Misaka Worst: “What happened to ‘I don’t wanna raise a brat’?”

Accelerator: “Shuddup!”

But then, as Misaka Worst flirts with Accelerator, Touma and Mikoto start to bring the groceries to the kitchen, a portal opens up in front of Touma and Mikoto, causing them to gasp, causing Accelerator and Misaka Worst to look at the two.

Accelerator: “What the fu—!”

(Either you can choose if MHA characters are brought into the world of ToAru, or the characters of ToAru go to MHA.)