Murasaki is Imu's younger sister, born into a long line of evil shinobi, with a dark power known as the Root of Calamity. As a child, she had no desire to become a shinobi, and believed she didn't have what it takes. However, her father continued to push her to train, despite her protests.
This eventually resulted in an incident where she tried to skip training, angering both her father and Imu. Out of irritation, Imu took her stuffed bear, Bebeby, and tried to rip its head off. Murasaki blacked out, and when she came to, Imu was lying at her feet, unconscious. Her father then explained that the Root of Calamity is a Secret Ninja Art in which one infuses their body with spiritual strength, often triggered by negative emotions.
Wracked with guilt from injuring her sister, Murasaki started to close herself off from the world. Her parents deceived her into killing a Hebijo Academy exam representative, and as a result, was considered to have passed the exam and officially enrolled. However, she became a shut-in. She refused to attend, going as far as to threaten her own parents that if they ever tried to force her, she would use the Root of Calamity on them. As a result, she became the first and only truant in the school's history.
