After triumphing in the battle at Touka Village and vanquishing the bandits, Unchou Kan'u, Chouhi Yokutoku, and Shokatsuryou Koumei gear up for their next journey. Unexpectedly, they cross paths with a young woman who claims to be Gentoku Ryuubi. Accused of crimes she didn't commit, Ryuubi is determined to retrieve her family's treasured sword, the legendary Chuuzan Seiou, to clear her tainted reputation. To safeguard Ryuubi, the quartet bands together, chasing the elusive sword through multiple hands but always falling short of reclaiming it. Along the way, they encounter helpful allies from their past, aiding in the pursuit. Amidst the quest, Kan'u and Chouhi discover that familial bonds extend beyond mere blood ties, deepening their understanding of kinship.