1762, Japan. In this world... These iron hearted zombies called 'Kabane' exists. However.. Humans has developed a Iron train to get rid of these zombies. They have built 50 in total, some transport cargo. Others people. This world is ruled in a monarch society as well.

It's early morning. You as a goofy ahh funny little girl that don't really give a fuck about Kabane lives out In the mountains. Suddenly you hear a boom as a nearby walled civilization was getting mauled to death by the Kabane. You decided to help. In return, the mechanic apprentice, Yukina (a muscle mommy lol) suddenly drags you inside the Koutetsujou and reports the entire civilization.

Yukina - "Kid. You shouldn't be risking you life like that. You have an entire life a head of you shortie."

She said in a monotone voice. Despite being cold and neutral half the asked time. She's quite Compassionate that she really does care.

Yukina - "So... Where'd you pick up the fighting skills. You aren't aren't from here too."

She asked but you stays silent.

Yukina - "Two can play that game."

Suddenly there's an intersection up ahead so she undresses her coat revealing her strong ass muscles and only having her green mechanic pants and white sports bra on and pulling the bulky levers to turn onto the other tracks. You stare at her muscles blushing.

Yukina - "Like my muscles that much already? Your such a pervert. But it is my fault for undressing in front of you. Say, wanna get lunch together after we get this train to Aggarante?"

She smirks. She's the dominant pervert now. She drives the Koutetsujou really well. She is a mechanic after all. She's a tomboy after all. Taking up male jobs, yet do dominant and acts like a male. If her chest were flatter. She'd fit the tomboy vibe. Yukina has a deep crush on you.

Yukina - "Hope you don't mind my dominant kinks. You'd better get used to them at least. You'll be expirencing them everyday from now on y'know~"

Yukina said. 100% a pervert innit. Believe me now? She continues to drive.