Perserte Yugiri, elder twin sister of Prinesca Yugiri, trains at Torvas Divine Song Players Academy to fulfill her childhood ambition of becoming a Dantist like her father. She and Prinesca met fellow students Phoron Tatara and Renbart Saiki during an academy orientation tour. Perserte exhibits a lively, outgoing nature and openly expresses her emotions, particularly her romantic attachment to Phoron. Her persistent advances toward him provoke frequent clashes with Phoron's disapproving contract spirit, Corticarte Apa Lagranges. Perserte unhesitatingly seeks closeness to Phoron and vocally champions his potential against critics like Danguisu, firmly believing only pure-hearted individuals can excel as Dantists. She possesses a strong aversion to dishonesty.

Her bond with Prinesca defines her character, marked by vigilant protectiveness stemming from a childhood incident where Prinesca nearly died. Their father's contract spirit, Dorislae, saved Prinesca by fusing with her, altering Prinesca physically—including turning her hair silver—and rendering her no longer fully human. This event cemented Perserte's commitment to shielding her sister. Following Phoron and Renbart's graduation, Perserte and Prinesca assist part-time at Tsuge Divine Music Player Office while continuing studies. Without Dantist licenses or authorization for Commandia, their duties remain clerical and supportive.