"Sengoku Collection" is a 26-episode anime series that blends historical elements with fantasy and modern-day settings. The narrative revolves around a mysterious artifact known as the Mirror of Oda Nobunaga, which transports various warlords and figures from Japan's Sengoku period into the present day. Each character is scattered across the modern world, stripped of their memories, and must navigate unfamiliar surroundings while searching for the mirror to return to their own time. The series adopts an episodic structure, with each episode focusing on a different historical figure as they adapt to contemporary life and confront personal challenges.

The central figure, Oda Nobunaga, serves as the catalyst for the story. After being transported to the modern world, she embarks on a journey to recover the mirror, encountering other displaced warlords along the way. These characters, including figures like Date Masamune, Sanada Yukimura, and Akechi Mitsuhide, are reimagined with distinct personalities and motivations. Some seek to reclaim their lost memories, while others pursue personal goals or conflicts rooted in their historical backgrounds. The interactions between these characters often highlight their struggles to reconcile their past identities with their present circumstances.

The plot intertwines historical references with fantastical elements, such as supernatural abilities and magical artifacts, which are tied to the characters' quests. The modern setting provides a contrast to their feudal origins, emphasizing themes of identity, adaptation, and the clash between tradition and modernity. While the series maintains a lighthearted tone in many episodes, it occasionally delves into deeper emotional and philosophical questions, particularly regarding the characters' sense of purpose and belonging.

As the story progresses, the characters' paths converge, leading to confrontations and alliances that shape their individual arcs. The overarching narrative builds toward a resolution involving the Mirror of Oda Nobunaga, with the characters' fates ultimately tied to their ability to confront their pasts and embrace their new realities. The series concludes with a mix of closure and open-ended possibilities, leaving room for interpretation regarding the characters' futures.