"It's Ryūchi Cave's."
"How do you know Ryūchi Cave's Senjutsu?"
Uchiha Retsuyō was puzzled. Could this kid be a Ryūchi Cave contract holder too?
"We fought Orochimaru before and took his Summoning Beast, Manda. We learned it from Manda's memories.
"Then we used Manda's flesh and blood to develop a Sage Jutsu Curse Mark, which could serve as a medium for training in Senjutsu."
Tamura Hiroshi gave a simple explanation, making it clear they had developed it themselves and hadn't made a deal with Orochimaru.
"You mean the one on your back?"
Uchiha Retsuyō considered this. He'd just noticed a patch of purple snake scales on the boy's back, surrounded by intricate markings. That had to be the Cursed Seal he was talking about.
"Yes."
"Is there only one?"
He wasn't satisfied. One was too few.
"The materials for making the medium are limited, and it'd be difficult for me to explain this to my superiors. One is the most I can manage. And after you get it, you can't openly use the Sage Jutsu Curse Mark. It can only serve as a medium for training in Senjutsu."
Tamura Hiroshi explained helplessly. This was a private deal between them, and they couldn't take it too far.
"How much of a boost does it give?"
Although Uchiha Retsuyō wasn't happy about it, he could only accept the offer. Now he just had to see how much of a boost the Sage Jutsu Curse Mark provided.
"That's hard to say. It mainly depends on compatibility and control. When I activate the Sage Jutsu Curse Mark, it mainly boosts my physical abilities. The increase in combat strength is greater than what I get from the Seven Day Breathing Method and Chidori Godspeed. I should be able to just about hold my own against