Steins;Gate: Boukan no Rebellion  

Steins, Gate: Rebellion of the Missing Ring, STEINS;GATE 亡環のリベリオン

The story is based on STEINS;GATE and revolves around Amane Suzuha in 2036. It depicts a world where time machines are controlled by a monopoly, resulting in global peace but at the cost of human freedom. Suzuha joins the Valkyrie rebellion to fight for change. Despite their failure on a significant mission, she loses all hope until she discovers her father's legacy - a time machine. With this newfound power, Suzuha may be able to dismantle the oppressive society and create a more equitable present and future.