山川優海

由美子(Yumiko)的朋友，目前在第3部队。她在圣华(Seika)粉丝俱乐部中排名第21位。她原本是一名医疗兵，但自从由美子和庆人开始参与更多前线行动以来，她也追随朋友们，越来越多地参与到与战斗相关的工作中。 她患有左眼斜视，并经常受肩膀僵硬的困扰。她有时会露出让人难以读懂其心思的面部表情。

简介来自 VNDB · 由机器翻译生成

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.

简介来自 VNDB