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.

The second season of Senran Kagura. 
Girls study at schools for modern shinobi. They dedicate their entire young lives to learning to become true shinobi, battling each other to polish their skills. And then one day, Asuka, whose grandfather is a legendary shinobi, encounters an ancient evil being named a "Youma" in the back alleys of Tokyo at Christmas time. 
 
Where there is light, there is shadow. Over 28 of the strongest and most well-endowed ninjas in history, both good and evil, will collide in a battle to determine true justice. And this deadly battle begins... right now. 
(Source: Crunchyroll, edited)

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A letter arrives at Death Cram School. Inside is a an invitation to a spa resort. 
Yumi declares to the four excited girls that, "No. This is evil itself," points out that they are slacking off too much. Shiki proposes, "When opinions are divided, it's time for boob rock-paper-scissors!" and then wins so they all go to the pool. 
 
There, girls from Hanzoo Academy, Homura Crimson Squad, and Hebijo Clandestine Girls' Academy also come, but Asuka says, "Let's have fun together today" and they call a temporary truce. 
 
However, a trivial matter sets off a sour quarrel and, at Yumi's suggestion, they settle it with a showdown in the style of the ancient shinobi.
 
(Source: Anime News Network)