CAS

"They could never fight back for she could kill them without mercy. She killed animals as a child, Bong Bong used to say. She stole money and robbed stores as well."

- CAS talking about Cassie's criminal acts to Shizuka

Cassandra's Automated Surveillance, abbreviated to CAS, is a software built into Cassie's laptop with the unique ability to act as an all-in-one surveyor. The artificial intelligence operating the software claims that she had been one of Cassie's employees until she was inserted into the laptop by means of the Switch.