山川優海

A friend of Yumiko who is currently in the 3rd Unit. She is ranked 21st in Seika-san Fan Club. She was originally a medic, but ever since Yumiko and Keito started in more frontline operations, she has been getting more and more involved with combat related work following her friends. She has left eye strabismus, and is often troubled with stiff shoulders. She sometimes has facial expressions that are difficult for people to read what she thinks.