|Quotes | Relationships|
|Also known as||Sprocket Gear|
|Relatives|| Mayumi (Twin Sister)|
|Hand Shaker|| Mayumi (former)|
|Special Skills|| Cooking|
|Anime||Conductor to Contract|
Koyori Akutagawa (芥川小代理 Akutagawa Koyori?) is the female protagonist in the anime. She is known as 'Sprocket Gear' and together with Tazuna, they are known as Team Gear. She's also a transfer student from Brazil. At first, she was unable to summon her own nimrods but revealed in episode nine she successfully summoned her own nimrod given her code name by Hibiki. It was revealed that Tazuna needed to hold her hand at all times to keep her life span stable but by doing this they can easily be identified as Hand Shakers.
Koyori is a very quiet girl who communicates through her actions. She is very kind and sweet. From the fights you can see that she is also very brave. She might also be shy since she does not speak or show many different reactions through her face. From episode 7, Koyori is unable to speak for some reason.