Shiina Kureha, 17 years old, is a second-year student at Kyabetsu High School. With a deeply curious nature, Kureha finds herself increasingly intrigued by conversations she overhears between her friend Suha and a somewhat quiet classmate named Shou. However, Shou's mysterious behavior only fuels Kureha's insatiable curiosity. She decides to approach him, thus diving into a world of unexpected revelations.