Jay, Kai, Cole, Zane, and Aria arrive at the coastal town of Stiix, and are greeted by a fisherman, who is promptly pulled into the ocean by his catch. The Red Ninja expresses his fear of water, noting that he used to be able to summon an Elemental Dragon to avoid it before.
The Ninja soon locate Ronin's shop to search for the Airjitzu scroll, finding valuable artifacts such as the Blade Cup. They are quickly confronted with the store's owner himself, who tries to trap them in a Vengestone net, but fails. Ronin then tries to sell them weaponry, including an Aeroblade, which can defeat ghosts.
Kai inquires the price of the Airjitzu scroll which Ronin starts at 200, though due to the Master of Fire's terrible negotiating skills, they agree on 450, which Aria can pay since she's rich, but she decided not to say anything. After they leave the shop, Ronin checks the vase where the scroll is actually hiding. Aria tells the ninja that she doesn't trust him but the ninjas say that they had no choice.
At Steep Wisdom, Wu is instructing Nya in the ways of the Water Ninja at the teashop's pond. Nya questions why she can't go help the Ninja as Samurai X, to which Wu responds by summoning his Elemental Dragon, something a samurai would be unable to do. He then explains to her how the ghosts' only weakness is water, before presenting her with the bucket test, wherein one is required to fill a hole-ridden bucket with water.
Meanwhile in Stiix, the Ninja find a job building a dock. Kai operates the crane, Zane keeps the Strangle Weed at bay, Cole and Jay lay down the planks, and Aria watches them do all the work.
All goes well until a fly distracts Zane and damages his language database. Through miscommunication, the Ninja end up destroying the dock. Aria decided that this was too much trouble and that they will steal the scroll of Airjitzu instead.
Atop a hill overlooking Stiix, Morro summons Soul Archer to aid in the theft of the scroll. Soul Archer shoots an arrow at the village's entrance, promising to take what is theirs.
Back at Steep Wisdom, Wu checks on Nya, who has appeared to have filled the bucket, only for Wu to see she used a stopper. He tells her to try again, saying to "go with the flow and find where you're weak," which sets her off, kicking the bucket into the pond, and leaves ranting that she's not a Water Ninja.
Misako, watching the whole thing, states the day was a waste, but Wu states he found Nya's weakness: feeling weak. He goes on saying while Nya is good at many things, she gives up when put in a position to fail. In addition, her temper has caused her to not even realize she filled the bucket, due to it being underwater.
In Stiix, Aria tells the team her plan; steal the scroll back from Ronin, use it to learn Airjitzu, and return it to the library. Leading the group on using stealth (after Jay falls into a woman's house), they reach the shop, where Ronin encounters Soul Archer, and claims he thought he had more time. Soul Archer states he'll return for his debt, and pushes Ronin towards Morro, who the mercenary mistakes for Lloyd.
Morro asks for the scroll, though Ronin tries to get him to sell his armor. Morro holds him up, though hears the Ninja, and tells Soul Archer to hide and take the scroll when they find it, while he ties up Ronin. As they search, Cole decides to steal back the Blade Cup for his father, while Soul Archer trap Jay with an organ's pipes.
Cole throws a water jug, causing Soul Archer to release the Blue Ninja. Morro reveals himself, and releases multiple ghosts. Kai then uses an Aeroblade and throws more to the others, once he confirms they work. In the chaos of defeating the ghosts, Ronin is cut loose. Upon finding the scroll, he takes it and calls for R.E.X. (which he claimed to have sold to open his shop) and makes his escape, destroying his shop.
Morro uses his powers to knock the mercenary out of his ship, and unable to whistle. Everyone gives chase, but Morro manages to get the scroll. The Ninja continue on, though are separated until only Aria is left (Jay falls into the woman's apartment again, Zane is left behind, Kai falls in the water, and Cole falls into a pile of crates).
"Morrow please, stop" Aria begged
"I'm sorry Aria, I love you little sister. I'll do something for you" Morro said showing her the scroll of Airjitzu.
Aria fell into the water and Morrow also learns Airjitzu and escapes on his dragon, taking Soul Archer with him. With one last look at Aria, he left. Ronin arrives on R.E.X., offering to save Aria in exchange for something she has, which she agrees since she can't swim.
On the pier, Jay, Zane, Kai, and Cole regroup and lament on the situation. After Aria is dropped off, Ronin reminds her of his deal, and what he said about second chances before leaving, wishing the Ninja luck in saving Lloyd.
Cole is initially confused, though Aria explains there may be an alternative to learning Airjitzu. Cole is still confused, as Ronin makes deals in his favor and Aria's a horrible negotiator, while Jay questions Aria on what she gave Ronin.
Aria reveals she gave him everyone's shares of the tea farm, much to everyone's horror as Wu wouldn't believe it, Aria didn't really care. Kai says since Lloyd's paying a bigger price than he did, he'd do it again. As Cole questions how they'll learn Airjitzu, Aria said they'll see.