Kamimizo is a high school student who has animal-like ears, which are not visible to anyone else except her. These ears also come with the unique ability of being able to listen to other people's heartbeats. These heartbeats may increase due to various factors, such as exercising, getting surprised, and of course, being in love. Naturally, Kamimizo has to endure hearing the excitement of love every single day in high school. However, her heartbeat also increases due to one specific person: Samukawa, her childhood friend. Despite this, she was not the one who's heartbeat increased first...