Sis, approximately 32 years old, oversees operations for Eden, a group pioneering innovative online image recognition and social networking initiatives. Her distinctive personal traits and interests unsettle her younger NEET companions in the group. Though frequently attending classes across various university departments, she holds no formal student enrollment.

She functions as an enthusiastic assistant to Eden's leader, Kazuomi Hirasawa, actively supporting him by coaxing and encouraging his initiatives to bolster the group's collaborative dynamics. During critical operations, she participates directly—such as assisting in the hijacking of a trailer transporting Juiz supercomputer units alongside fellow members like Micchon—demonstrating her commitment to Eden's objectives.

Sis identifies with Eden's self-perception as ideological NEETs, despite their activities resembling those of entrepreneurial individuals more than stereotypically inactive youth.