Shirohige's first challenge was to use a musical instrument of his choosing and use it to combat a siren's song. Shirohige didn't leave the grand piano's seat and affirmed to use the piano as his musical instrument.
As the first challenge began, the familiar setting of the musical theater dissolved, replaced by another scene. The ceiling of the stage transformed into a starless night, where the only illumination came from the soft glow of the moon reflecting off the dark waves of the ocean.
Suddenly, the theater found itself transported to a small, isolated island, surrounded by endless stretches of water in every direction. Weiss, Ayame, and the rest of the team felt a chill in the air as they looked out into the vast expanse of the ocean.