Kamimizo is a high school student with animal-like ears that are not visible to anyone else except her. These ears come with the unique ability to listen to other people's heartbeats. Heart rate may increase due to various factors, such as exercising, feeling surprised, and of course, being in love. As a result, Kamimizo has to endure hearing the excitement of love every single day at school. However, her own heartbeat also races at the thought of one specific person: Samukawa, her childhood friend. Despite this, Kamimizo's heartbeat was not the one that skipped first...