Profile

She usually puts up a tough and quiet front, but she is extremely fond of cute things, especially stuffed animals, even though it is a set-up or a trap of the enemy. It also seems that she is overprotective to the stuffed animals she has.

She is able to sense when danger is coming. She is good when it comes to concentrating and is very strict in her training and would continue with her training even when she is needed to do something else. Shiina's training mostly consist of balancing objects such as broomsticks, scissors and mops on her fingertip, sometimes balancing one on each of her fingers simultaneously while doing something else.

She also usually says the phrase "how shallow-minded" (あさはかなる, asahaka naru) when she remarks on her colleagues' actions. But in the English Dubbed version her phrase has been translated as "this is so stupid" instead.

Before joining the SSS, she lived in the deepest underground level (which is not yet controlled by guild). She was called by Yuri and Noda the "underground" or "final" boss. Shiina's first meeting with Yuri and Hinata resulted in bloodshed, and the deaths of both of them, until Hinata restrained her letting Ooyama, Chaa, and Noda rescue them and capture Shiina. However after Noda runs off with Chaa chasing him, Shiina manages to escape, and relentlessly attacks the remaining group as they try to escape. Eventually the group manages to make it back to the Afterlife School where "Tenshi" protects them, while they regroup with Chaa and Noda to form a counter-attack plan. Shiina is finally defeated after being backed into a wall and cut in half by Hinata, who was kicked off the roof while equipped with two swords. In the infirmary Shiina is invited by Yuri to become a member of the Afterlife War Front, to which she cautiously accepts.