In 2022, Kazamidori Aki works at the Time Travel Research Facility alongside her assistant, Miyama. Their job involves using Aston, a state-of-the-art technology that meticulously scans and recreates every aspect of the city from the last twenty years. This recreation can then be projected onto the client's mind through a process called In-Brain time travel, allowing them to revisit their past experiences. However, because the process is limited to the mind, no changes can be made to the present, ensuring the prevention of any temporal paradoxes. Aki utilizes her talents to assist those who have made mistakes in the past, bringing about positive change. Despite her expertise, Aki's background is shrouded in mystery, leaving her as an enigma who must confront her personal demons.
