A female student attending Butei High School in the Inquesta department who comes from the wealthy and prestigious Sasaki family and is descended from Kojirō Sasaki. Like her ancestor she is a practitioner of the Ganryū sword style and can even use Kojirō’s famous Swallow Cut technique. She first met Akari at a food stand where they share a leaf pie. She has since developed an obsessive crush on Akari to the point that she is willing to resort to violence in order to make Akari break off her amica relationship with Aria who she is extremely jealous of.
She is also known to stalk Akari and take candid pictures of her changing or in a swimsuit. She later becomes Shirayuki Hotogi’s amica after Shino passes her test and Shirayuki senses her strong feelings. Ironically, the two share similar traits: both have the appearance and grace of a yamato nadeshiko but their appearances belie their great skills as swordswomen, their mutual dislike and jealousy of Aria, they both come from influential families, they both harbor strong feelings for someone and they both have yandere-like tendencies.
Shino prefers to use a standard katana in battle but she also possesses an ōdachi called the Monohoshizao like her ancestor’s.