Juu – Ninpou Makai Tensei

Baka description:

This is the latest story of the famous “Ninpo-cho” series of Yamada Fuutarou. It begins in 1638, during the Shimabara Rebellion, where a powerful swordsman who should have died is instead transformed by an arcane ritual into a demonic creature. As time passes, more swordsman facing death go through this transformation. What could these new, demonic swordsmen be planning?

Have fun!

Japanese raws:

chapter 20 here new
chapter 19 here
chapter 18 here
chapter 17 here
chapter 16 here
chapter 15 here
chapter 14 here
chapter 13 here
chapter 12 here
chapter 11 here
chapter 10 here

Other names:

十 ~忍法魔界転生~