Shihōin Naraku was well aware of how dangerous training in Sage Mode at Ryūchi Cave was. He was not the one going, anyway. That was something Kabuto Yakushi had to consider for himself.
Besides, Naraku did not need to train in Ryūchi Cave's Sage Mode. He had already won it in the system lottery and mastered it long ago.
And training in Shikkotsu Forest's Sage Mode was no safer than training at Ryūchi Cave.
In fact, by comparison, Naraku still felt that Shikkotsu Forest's training method was more dangerous. If someone without the aptitude tried it, they would inevitably die without even leaving a body behind.
So he did not concern himself with the dangers Kabuto Yakushi would face while training in Sage Mode. Of course, given Kabuto's aptitude, his chances of success were actually quite high.
As long as nothing unexpected happened!
After handing the task to Kabuto Yakushi, Naraku did not linger and soon returned to Konoha.
By then, it was broad daylight. After arriving home, Naraku carefully thought through his plan and only breathed a sigh of relief once he was certain there were no problems.
"It's about time. I'll head to the Hokage Building first."
If his guess was right, Tsunade would soon send someone to summon him.
Sure enough, when he arrived at the Hokage Building and entered the office, the first thing Tsunade said upon seeing him was, "I was just about to send someone to get you, but you're here quite early."
"That's because I knew you were back, Teacher." Naraku greeted her, then sat down to one side.
"Don't think you can slack off just because I'm back. Come over and help me with these documents first." Tsunade looked at his lazy demeanor in annoyance and said bluntly, "I've looked over