"Harukanaru Toki no Naka de 3: Kurenai no Tsuki" is a 12-episode anime series based on the otome game of the same name. The story is set in a fictionalized version of Japan's Heian period, blending historical elements with fantasy. The protagonist, Akane Motomiya, is a modern-day high school student who is transported to a parallel world called Kyou, a land resembling ancient Japan but plagued by conflict and supernatural forces. Akane is revealed to be the Ryuujin no Miko, a priestess destined to protect Kyou and restore balance by summoning the power of the eight guardians.

The narrative centers on Akane's journey to unite the eight guardians, each representing a celestial direction and possessing unique abilities. These guardians include Taira no Atsumori, a noble warrior; Minamoto no Yoshitsune, a skilled and strategic fighter; and other figures inspired by historical or mythological personas. As Akane navigates the political and supernatural challenges of Kyou, she forms bonds with the guardians, who pledge their loyalty to her cause. The central conflict arises from the machinations of the Taira clan, led by Taira no Kiyomori, who seeks to exploit the power of the Ryuujin no Miko for his own ambitions, threatening the stability of Kyou.

Themes of duty, loyalty, and sacrifice are woven throughout the story as Akane grapples with her role as the priestess and her growing attachment to the guardians. The series explores the tension between personal desires and the greater good, as well as the impact of destiny on individual lives. The plot unfolds through a mix of political intrigue, battles against malevolent spirits, and moments of introspection, culminating in a climactic confrontation that tests the resolve of Akane and her guardians. The anime maintains a balance between action, romance, and historical fantasy, offering a cohesive narrative that stays true to its source material while appealing to fans of the genre.