被秘藏在基地中、伪装成战斗机的龙选中了桧曾根,并和她一起飞向天空。 就这样,搭乘“OTF(变态飞翔生命体)”的飞行要员, 成为了桧曾根的工作。 甚至能左右国家命运的龙, 究竟隐藏着怎样的秘密呢……。With the summer in the sea, she draws the relationship between her younger brother and her older sister who is shaking out.