Akagi was with Princess Yuki Yatsurugi when she dispatched the bandits who had cornered them, and they were met by the Warrior of Light and Oboro Torioi. Though he insisted she accept the help of Oboro's guild, Yuki refused, proclaiming that the shinobi of Doma were why her family's treasures were missing, as they had ultimately betrayed Doma to the imperial invasion. She left, but Akagi lingered, asking the Warrior of Light to assist them anyway, as Yuki deserved to see the value in asking for help.
He asked the Warrior of Light to meet him and Yuki at Memeroon's Trading Post, where he told them of a black market tip that Yuki was pursuing. He only realized the princess had wandered away after he was finished talking. The Warrior of Light used smoke bombs to clear a path for Yuki as she investigated a Salthounds' ledger in the Poor Maid's Mill.
Akagi requested their help again when Yuki decided to investigate where her family's jade jewel was, at Oschon's Embrace. Akagi was in distress, as enemy guards were chasing after Yuki. The Warrior of Light pursued and found Yuki cornered by an unfamiliar adversary in the Salt Strands who revealed himself to be Redway, a young shinobi who coveted the Yatsurugi's family treasures. As Oboro and Akagi rejoined the Warrior of Light, Redway made his escape. Akagi insisted that Yuki was grateful for their assistance, and Oboro informed him of Redway's schemes as the pairs separated.
After Jacke Swallow provided a tip about the Salthounds, Akagi and Yuki met the Warrior of Light in the Dock Storehouse where Oboro made his home. They discovered that a woman named Rosalinde of the Truehounds was spying on the group through Redway, likely following them to learn where the treasures were for herself. Yuki announced she needed no further assistance, explaining that she had been traumatized by her previous vassals giving their lives to protect her when the Garlean Empire invaded Doma. Akagi insisted that he was loyal to her not out of duty or because of coin, but because he genuinely wished to see her safe. He threatened cut open his stomach and become another dead body meant to protect her if she refused the Oboro's help. When he begged that she trust the shinobi, she finally conceded, though demanded they not try to give their lives for her.
Oboro discovered that a collector had purchased the Midare Kanemitsu dagger and it was being brought north, so they must attack and reclaim it mid-transit. Oboro sent Yuki and the Warrior of Light to purchase lavender incense from Kyokyoroon in Limsa Lominsa to knock the pirates out when they would smoke their pluto. As they shopped, Yuki saw newly arriving Yatsurugi vassals, which enraged her. When Akagi arrived, Yuki pulled him away to hide.
In Fisherman's Bottom, the Warrior of Light switched the pluto for the incense. The four shinobi stowed away on the Truehounds' ship, arriving in the Dravanian Forelands where the buyer was. As they searched the crates for the dagger, Akagi was wounded by lingering guards while Yuki located the dagger. Redway appeared, holding the four hostage as his crew slowly awoke back up. Akagi offered to give himself as ransom, but Yuki stepped forward and allowed herself to be taken. Distraught but alive, Akagi begged for Oboro and the Warrior of Light to save Yuki.
Returning home to the storehouse, Oboro and the Warrior of Light made plans to save Yuki. Akagi was still injured, and stayed put, knowing he would slow them down.
Oboro planned to get himself captured to throw Redway off and allow the Warrior of Light to arrive and save them. Akagi was initially furious that the Warrior of Light returned to him, briefly wondering if Yuki's distrust of shinobi had been founded. As they revealed it is but a trick, he sheepishly recanted his insults and joined them in saving Oboro and Yuki. In Western La Noscea on the open sea, Akagi finally used his axe for combat, saving Oboro and Yuki with the Warrior of Light and attacking Redway and Rosalinde. They saved the vassals and the dagger, just as Rosalinde killed Redway for failing. They took Rosalinde down next, and returned to shore.
Akagi tended to the vassals, ensuring they were well as Yuki prepared to leave with them back to Doma.
Akagi is a Raen Au Ra with long black hair and golden eyes. He wears a blue and white Saurian tabard of Aiming with matching gloves. He wears black Buccaneer's sarouel and tall black Carpenter's boots. In battle he swipes the battle axe Foolkiller, a single headed axe with a long red handle.
Akagi is a diligent man who takes pride in serving Princess Yuki and her house. He often frets for her safety, especially during her time in Eorzea searching for her family's lost treasures. He is willing to give up his life for her to understand the importance of trusting others, proclaiming that if he died, he would be just another body in the pile of those who had given themselves for her, leaving her even more alone than before.
He admits that his axe is mostly for show, leaving combat to Yuki and the Warrior of Light.