"Harukanaru Toki no Naka de: Ajisai Yumegatari" is a two-episode OVA adaptation of the "Harukanaru Toki no Naka de" franchise, which originates from a visual novel series. The story is set in an alternate version of feudal Japan, blending historical elements with fantasy. The narrative centers on Akane Motomiya, a high school girl who is transported to the mystical world of Kyo, a land resembling ancient Japan but filled with supernatural forces. In Kyo, Akane is revealed to be the Priestess of the Dragon God, a figure destined to protect the land from demonic threats and restore balance.

The plot unfolds as Akane encounters the Eight Guardians, warriors bound to protect her and aid in her mission. Each Guardian possesses unique abilities and represents one of the cardinal directions. Together, they must confront the growing influence of demons and the malevolent Oni clan, who seek to plunge Kyo into chaos. Akane’s journey is not only a physical battle against these forces but also an emotional and spiritual quest to understand her role and the connections she forms with the Guardians.

The OVA specifically focuses on the relationship between Akane and one of the Guardians, Shimon Nagareyama, whose tragic past and internal struggles add depth to the narrative. The story delves into themes of duty, sacrifice, and the bonds that tie individuals together across time and space. While the OVA provides a self-contained arc, it also serves as an introduction to the broader lore of the "Harukanaru Toki no Naka de" universe, offering a glimpse into the intricate interplay of history, mythology, and character dynamics that define the series.