Princess Mary is first seen in Cyrus's class alongside Therese. She is quick to answer questions and ask them as well, receiving continuous praise and attention from their professor.
Therese, who harbors unreciprocated feelings for Cyrus, reports a false rumor to the headmaster, Yvon, out of jealousy. She claims an illicit relationship between Cyrus and the princess, which results in Cyrus leaving the academy on sabbatical.
After Cyrus returned from his sabbatical, Princess Mary went to find Cyrus in the library and reprimanded him for his tardiness before Cyrus starts his lecture with his new class.
- "...It is just as I feared. It appears to have been Professor Paul’s ship that went down. Professor Paul... Please be all right..." —Speaking to Princess Mary (Rippletide)
- After completing Cyrus's story, Princess Mary can be found in Rippletide for an optional sidequest.