Hibiki and Misa are living together. They've been dating for nearly a year, but lately they've been clashing frequently over trivial matters, leading to more minor arguments. Although they don't dislike each other, they both feel a growing emotional disconnect and growing unease. Amid this tension, Misa plans a surprise to celebrate their one-year anniversary. However, due to Hibiki's work running late, the surprise falls flat and never comes to fruition. This incident becomes the catalyst for new developments in their relationship.