After their Seiryou High graduation ceremony, Ishida and Yano experienced an uncomfortable incident that caused their friendship to weaken for three years. Ishida saw Yano on a train one day, but his companions doubted it. Now, Ishida is committed to searching for his old friend and is accompanied by former Student Council colleagues on this tense journey. They're unsure of Yano's location, as it's been eight years since the occurrence.