This here is the storyline of this book. 

Ninja Gaiden Sigma/Senran Kagura Ninja Flash: 

Senran Kagura: Deep Crimson 

Ninja Gaiden: Dragon Sword

Senran Kagura: Estival Verses

Ninja Gaiden 2: Black 

Senran Kagura: Shinovi Master -Tokyo Yōma-hen

Ninja Gaiden 3: Razor's Edge

Ninja Gaiden: 4

I hope you guys like what I've done with it. And there will be some scenes from Ayakashi Triangle. 

Speaking of that anime, I had a with @EricHuber98 about mainly Y/N's gender bend/female form. I'm not gonna have Y/N stay as a girl forever if that's what you're wondering, just more of Kampfer thing, switching genders which will be caused by what ever ideas you can think of. 

It will happen in some chapters or special chapters. As for his female form's appearance, it will look like this. 

Okay, with that done. I can work on the first chapter of this book. If you guys have some ideas for it, let me know at the comments below. Peace out and enjoy!