15 years prior to the events of Octopath Traveler, Ophilia was orphaned following a war that ravaged her homeland. She was adopted by Archbishop Josef, Lianna's father, but shut herself away due to the despair of losing her family. Wishing to bond with her sister, Lianna took Ophilia to her favorite place, a hilltop that oversees the cathedral.
Lianna was to be the next Flamebearer and perform the Kindling, but her father lay on death's door after being discreetly poisoned by Mattias. Sensing that her sister did not want to leave their father's side, Ophilia ventured into the Cave of Origin and retrieved the Sacred Flame herself, deciding she would perform the Kindling in Lianna's stead.
Archbishop Josef succumbs to the poison around the time Ophilia lights the Sacred Flame in Goldshore. Overwhelmed with sadness by her father's passing, Lianna is approached by Mattias, who deceives her into believing he can bring her father back to life if she steals the Sacred Flame. Under his orders, Lianna meets Ophilia in Goldshore and drugs her in order to steal Aelfric's Lanthorn.
Lianna serves as Mattias's vestal in Wispermill during the ceremony in the Ebony Grotto to bring Galdera's Flame to Orsterra, under the persisting belief that it will resurrect her father. The ceremony is interrupted and she is brought back to her senses when Ophilia arrives and reminded her of a lesson by her father in their childhood.
After Mattias's defeat by Ophilia and her comrades, she returned to Flamesgrace with Ophilia. However, due to the events at Wispermill, her father's death, and losing much of the people's trust due to her actions, she shut herself away from everyone similar to what her adoptive sister did 15 years ago. It was only when Ophilia reached out to her and brought her to their favorite place that she started to open up again and began to recover from her hardships.
- "Thank you." —Purchase
- "Ophilia! Yes, I would be happy to accompany you." —Guide
- "Thank you. I hope to see you again." —Part Ways
- "Stop that!" —Failure
- After completing Ophilia's story, Lianna can first be found in Flamesgrace and later on in Wispermill to start an optional quest with her and Eliza.