The Legend of Heroes: Sora no Kiseki the 3rd Evolution

Six months after the coup in Liberl was defeated, Father Kevin Graham of the Gralsritter is already back at work—retrieving an artifact from beneath Grancel Cathedral, a task he could handle alone but must share with his newest recruit, Sister Ries Argent, the childhood friend he would have preferred not to involve. A routine mission becomes something far stranger when the two descend into Phantasma: a mysterious realm with its own rigid rules, where the hidden pasts of the people who fought for Liberl's future—and the history of the Septian Church itself—wait behind doors that were sealed for good reason.