Sora Tenkūji (天空寺 宙) fights with the Saitama Earth Defense Force's HxEros team. She has short silver hair styled in pigtails, the rest flowing down her back. Sora maintains a kuudere composure, typically calm and collected, yet displays a distinct lack of conventional personal boundaries. This disregard manifests in her unannounced entries into teammates' personal spaces, notably her habit of slipping into fellow member Retto Enjou's bed to sleep, often while half-asleep herself.

She attends the same classroom as Hiiro Enjou, Retto's younger sister. Outside combat duties, Sora dedicates free time to drawing erotic manga. Her measurable H-energy contribution to the team's operations registers at 62.5MJ.

Her smartphone screensaver features Myuu, a character from the manga "Myuu and I." Sora's physical measurements are B86, W52, H78.