The Resurrection Hot Springs!!

Mirai first turns down Tatsumi's offer to meet the departed, but reconsiders after brooding over how often others measure her against her father. Because the dead are said to appear only after dark, the pair set out at night, and Mirai tells herself they will be back by dawn before Kakashi and Guy ever notice her absence. Sensing that Tatsumi needs her, she presses on into the mountains until fatigue sets in.

She asks to refill their canteens at a nearby hot spring, and though the water tastes foul to her, Tatsumi claims its heavy mineral content carries healing powers. They reach a cave tucked behind a waterfall where a ritual is already in progress, several young girls gathered close by. Mirai grows wary, yet Tatsumi cheerfully introduces the leader, Ryuki, who she says can grant special properties to the local spring.

Ryuki greets them warmly and offers Mirai a drink to formally welcome her into the fold. Suspecting it is drugged, she tips it out, and his friendliness vanishes as he orders her restrained.

Ryuki scolds Tatsumi for bringing along someone so sharp, but vows the ceremony will proceed all the same. To his shock, Mirai swiftly beats back his followers and demands to know more about what the ritual truly involves. This installment comes from the Konoha Shinden: Steam Ninja Scrolls manga, published as chapter 11 in volume 2.