An imagined flag is defined in visual novels as an occurrence that serves as a turning point for the whole tale. A player who triggers the romance flag for a heroine will advance along her path, whereas a death flag indicates that a certain character will die later. Souta Hatate, a high school student, can see these flags over people's heads and can pull them down to prevent certain occurrences from occurring. He has used this capacity to save the lives of others. However, following a previous accident in which he was the lone survivor, he came to believe that only disaster would befall those who were close to him, and he has avoided from establishing friends or forming relationships ever since. However, things begin to change.