After sending the report to Mustang, the two brothers make a stop at the capital of the City of Water. This city is famous as a tourist town, but the latest attraction is a mysterious thief. The only clue is that the thief uses alchemy.
Through a series of events, Edward and Alphonse are asked by the detective there to help with the investigation and capture the thief, but...
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Ed and Al stop at Aquroya, the City of Water, in hopes of obtaining some information regarding the Philosopher's Stone. Ed cannot bear to think about Mustang's reaction when he returns with nothing.
Elsewhere in the city, the police are chasing a notorious theif by the name of Psiren. Using alchemy, she escapes from the police.
Completely by chance, Ed is apprehended by a detective and brought back to the police station. Finding that Ed is a State Alchemist, he asks Ed to help him capture the elusive theif Psiren.
On his way out of the station, Ed comes down with a slight case of food poisoning and is taken to the hospital. There, Ed and Al meet a beautiful nurse by the name of Clara. Al is captivated by her and cannot seem to forget her beauty and kindness.
That night, Ed and Al help guard a priceless artifact from Psiren. However, she penetrates the police's defenses easily and escapes. Confronted by Ed, she wards him off with a little seduction that leaves him pinned to the ground.
Tending his wounds at the hospital, Ed stumbles in on Clara absorbing the life force of plants as upkeep for her alchemy. Al enters and divulges that the hospital is to be demolished. Clara, wanting to save the hospital, became a thief.
The detective barges in to notify Ed and Al that Psiren has sent out yet another note regarding her plans for the night. Ed and Al are stationed outside the mansion. Psiren caught by the owner's trap but freed by Ed. Later that night, Ed meets Psiren and asks, in return for saving her, for information regarding the Philosopher's Stone.
The next day, Ed and Al are shocked to find that the hospital has been demolished. They have been tricked by Clara. At the sight of the hospital, they are met by Clara now in a nun's garb. She claims that she was mortified at not being able to save the hospital and as a result, became a nun. Soon after, the monastery is also demolished. The brothers have been tricked yet again.
Psiren has become the star of hope for Aquroya as she has filled it with life once again with her antics. Thanks to her, Aquroya has been give a second chance to live before it sinks into the lake.
Ed decides to get payback for her trickery and confronts Psiren later that night. Ed easily wins their battle and she is apprehended. As a reward, she tells Ed to head to Xenotime where it is rumored that there is someone researching the Philosopher's Stone.