Nene Alkastone, a 16-year-old mechanical engineer serving in the Heavenly Empire’s 907th Unit, combines youthful charm with a sharp intellect. Her infectious cheerfulness masks her brilliance in weapon development, particularly anti-astral machinery. Trusted by the Empire’s weapons division, she field-tests experimental gear, including her crowning achievement: the artificial satellite *Tetrabiblos Star*. Controlled through a specialized ring, this device launches grenades and artillery to disrupt astral entities during combat.

Her history with Iska and Jhin Syulargun predates the unit’s founding, while her mentor-protégé bond with Crosswell Nes Lubigate—though never leading to his formal succession—shapes her technical prowess. After briefly trading combat gear for a waitress uniform during Iska’s incarceration, she re-enlisted at his request. Addressing him as "Iska-nii," her sibling-like admiration gradually intertwines with unspoken affection, fueling protective instincts and rivalry with figures like Sisbell Lou Nebulis IX. This tension drives her alliance with Mismis Klass to monitor Iska’s interactions.

Nene pioneers magi-resistant armaments and sustains the unit’s communication infrastructure. Beneath her playful exterior lies a tactical mind that deploys inventions with lethal precision on the battlefield. Trained as a prodigy under Crosswell’s tutelage, her growth balances camaraderie with the quiet complexity of concealed emotions, navigating unexpressed feelings while strengthening bonds with comrades.