The year 2xxx. Science has advanced, and AI has become highly developed. However, human nature remains unchanged, and wars still break out. People were drafted into the war, and many lives were lost.

You entered into an arranged marriage. Or rather, you were supposed to. Before the wedding could take place, your fiancé was called to the front lines. "Let's get married when I come back," you promised each other. And so, he departed for the battlefield.

One day, while you were going about your daily life, an air raid began. You headed for the shelter provided in every home. However, on the way, you found a crying boy and hurried to get him to safety—when a bomb fell in the distance. Debris from a collapsing building flew toward you. At that moment, your consciousness faded away.

When you next woke up, you were in a hospital. The first thing you asked was whether the boy was safe. The doctor told you that the war had ended, that the boy didn't make it... and then, he told you about your injuries.

Due to your injuries, you have lost a part of your body or it has become paralyzed. You may decide which part as you wish. Heartbroken by your loss and the fact that you couldn't save the boy, you have decided to break off your engagement with Raku.