"Toki no Mon - Shinsengumi 70's" is a manga series that blends historical elements with a unique twist, reimagining the famed Shinsengumi, a group of samurai from the Bakumatsu period, in a 1970s setting. The narrative centers on a group of young men who form a biker gang called the Shinsengumi, drawing inspiration from the historical group's ideals of loyalty and honor. The story explores their struggles, camaraderie, and conflicts as they navigate the turbulent social landscape of 1970s Japan.

The protagonist, Toshizo Hijikata, is a fiercely determined and charismatic leader who embodies the spirit of the historical figure he is named after. Alongside him are other key members, including Isami Kondo, the group's co-founder, and Soji Okita, a skilled but enigmatic fighter. Each character is reimagined with traits that reflect their historical counterparts while adapting to the modernized setting. The group's dynamics are shaped by their shared sense of purpose and the challenges they face from rival gangs, societal pressures, and internal tensions.

The plot unfolds as the Shinsengumi biker gang seeks to uphold their code of honor in a world that often clashes with their ideals. Their journey is marked by intense rivalries, personal sacrifices, and moments of introspection as they grapple with their identities and the changing times. The series delves into themes of loyalty, rebellion, and the search for meaning, all set against the backdrop of a rapidly evolving Japan. The narrative balances action-packed sequences with quieter, character-driven moments, providing a multifaceted exploration of the group's journey.

Historical references are woven into the story, offering a layer of depth for readers familiar with the original Shinsengumi. However, the manga stands on its own, using the 1970s setting to create a fresh and engaging reinterpretation of the legendary samurai group. The interplay between the historical and modern elements adds a unique dimension to the narrative, making it accessible to both fans of historical fiction and those drawn to stories of youth and rebellion.