Fukigami Hatsune

Shinji's cousin who is currently his little sister as well.
A kind-natured and honest girl who is popular with boys. However, the only boy she can interact without any problem with is Shinji because of her shyness.
Doesn't have any kind of special skills, nor can she help Shinji out in any way.
In fact, Hatsune does not understand the nature of his missions, but wishes that he doesn't do anything dangerous.