Sumi's and Sonoko's classmate and fellow hero. Gin is the youngest and the shortest out of the three friends, also being physically the strongest and the most sporty one. She uses a pair of large blades in her hero form. Gin is a kind, energetic girl, with a lot of spirits and positive attitude. She is a tomboy but has a girly side. Her main interests consist of sports and different kinds of competitions. During her free time, mostly before going to school, she looks after her younger brother. That, along with her helpful nature which makes her give a hand to everyone needing it, often causes her to be late for her classes and meetings.

Spoiler

During the fourth battle with the Vertexes, she, along with Sumi and Sonoko, fell into a trap in which they all got seriously injured. Gin, being the only one who was still able to fight, decided to protect her friends and repel the three attacking enemies by herself, which was successful but came at the cost of her life.