Anomaly System Quadrangle

During his high school years, Maki Eiji was known to be a delinquent who skipped classes and got into brawls. Chino Kotoha was the only person who showed him kindness until she became a target of other delinquents, causing her to undergo irreversible changes. Years later, when Eiji crosses paths with Kotoha again, he is filled with remorse and regret. Suddenly, a mysterious woman appears in revealing clothing, offering to transport him back in time to right his wrongs. Eiji accepts the offer, but the situation is not as straightforward as it appears. Kotoha has her own hidden secrets from those fateful days, and Eiji may not be the only one making a trip to the past to change history.