10 years ago. Misuzu used to be an extreme brocon. However, due to a trivial incident, she erased her brother's existence. The 10-year gap has become a burden on the brother's life itself, but as if inversely proportional to it, an intense desire for approval from his sister arises and torments his Kokoro. Wanting to go back to the time when they were close, the brother uses [hypnosis] to control his sister, but...