__Height:__ 161 cm (5'3")

A first-year student and the youngest in the series. She speaks with a high-spirited gyaru accent and has a lot of friends outside of her shinobi team. Despite her appearance, she's someone her classmates can always count on during training. She is seen mostly with her phone. Like Yumi, her parents were killed, but unlike in her case, Shiki's parents died in the line of duty as shinobi. Her preferred weapon is a two-headed scythe, and she can summon a bat swarm during combat.
(Source: Wikipedia)

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)

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)