Leaving aside Ryūsetsuna's disappointed departure, Karin immediately reported to Shinji the intelligence Kusagakure had recently gathered.
Shinji had long expected all the various factions, including the Five Great Shinobi Villages, to continue investing in research on demons, so he wasn't surprised.
As for Kusagakure having uncovered the whereabouts of Muku, Tanjiro of Upper Moon One, and the others, Shinji acted completely unconcerned.
As the Lantern Bearer, he had known the locations of Tanjiro, Narume, and the other Upper Moon demons lingering in the Shinobi World for a long time.
The reason he hadn't dealt with them was simple.
For one thing, they had behaved themselves and caused no trouble in the Shinobi World.
For another, he had temporarily been unable to spare the time.
As the Demon Slayer World was completely infiltrated by the Overlord of Fear, all the power within the Demon Slayer World was being suppressed by the Overlord of Fear, including the pollution.
Therefore, Tanjiro, Narume, and the others could no longer spread pollution, because the "source of pollution" behind them was about to become food in the Overlord's belly.
Under such circumstances, as long as Tanjiro and Narume didn't cause trouble, Shinji could afford to turn a blind eye to them for the time being.
However, after learning of Ryūsetsuna's request, Shinji suddenly fell into thought.
At present, he happened to be short of one or two ninjas to test Blue Spider Lily No. 1 on, and after thinking it over, Ryūsetsuna seemed like a good candidate.
One had to know that ninjas with different constitutions reacted differently to injections of Blue Spider Lily No. 1. It was just like how demons were divided into weaklings and the Twelve Kizuki.
Compared with Naruto, who was a Jinchuriki, Sasuke, who possessed a Kekkei Genkai, and Karin, who