Ein Neubauten is an adult woman with short white hair, adorned in a gray dress and gloves, her face perpetually concealed. She forms the trio known as the Noise Sisters alongside Stür and Zende Neubauten, collectively dubbed the Three Witch Sisters. Tasked with combating the Earless, their combat style blends destruction and construction into a singular, striking aesthetic.

The sisters launch an assault on Mu and Echo Rec after detecting a mysterious green light they believe connects to Jimi Stonefree. During the clash, Echo recognizes the trio and requests an autograph—a moment of unexpected fanfare that delights them, prompting them to eagerly request his in return. Yet camaraderie quickly shifts to cunning as they seize Echo, attempting to manipulate him against Mu to awaken Jimi. Their scheme unravels when Bilin Valentine intervenes decisively, overpowering the trio to rescue Echo and Mu.

Ein’s bond with her sisters fuels their every move, defined by an unwavering dedication to their cause and seamless synchronicity in battle.