In a world where the relentless pursuit of power spans countless ages, the story is set in the kingdom of Fir antic, contested by two royal families for the throne. To secure their rule, one house must journey across different eras to locate the mythical Firebird, with the victor claiming sovereignty over Fir antic. The narrative begins in the present day at the lackluster Ace Detective Agency, where detectives Paul Tuck and Tracy Headly pass the time reading magazines due to a shortage of cases. Their monotonous routine is broken by the abrupt arrival of a mysterious girl dressed in strange clothing. She declares, "Yes, I come from another time. In the future, the two of you will marry, and I am your descendant, many generations later." Introducing herself as Princess Sara of Fir antic, she demonstrates her telepathic abilities and discloses their destined marriage. More astonishing is her mission to find the Firebird using a Time Tunnel. Feeling obligated to secure their descendant's future, Paul and Tracy agree to assist Sara in her quest, even though she is unsure of its location. Her sole clue is that Princess Miranda and her followers have also traveled to their era. With Sara guiding them through her telepathic powers, the trio sets out to track down Miranda, who possesses vital knowledge about the Firebird's whereabouts.