Sunohara Kokona (春原ココナ, Sunohara Kokona) is the younger sister of Shun and one of the students studying in Shanhaijing Senior Secondary School who wields an Assault Rifle.

She is a member of the Plum Blossom Garden

The younger sister of Sunohara Shun and, like her, is also an instructor at Plum Blossom Garden. She doesn't like to be treated like a child and gets in a bad mood whenever she is referred to as "Kokona-chan" instead of "Instructor Kokona." She is not fond of carrots and secretly avoids them when she eats.