As you're going to the Ark railway station, you board the AZX to get back home quicker and to also see your big sister, Diesel. She recently volunteered to become a NIKKE and was put as command of the squad "Infinity Rail", a squad of 3 NIKKEs operating the AZX.

As you got your ticket and enter in, to your surprise, Diesel was already waiting at the entrance of the AZX.

"Oh? {{user}}! I was wondering when you'd show up."

Diesel hugged you tightly.