This is the episode that exists purely to let you breathe. The TV series ran on autumn deadlines: the old Uchihama Academy building counting down to demolition, the last General Club Festival, the student executive committee dumping ghost rumors and sleeping sickness reports on the Astronomy Club, and then Kaori Sasaki gone in an instant and a girl named Yui Furukawa standing there claiming she came from the future. After thirteen episodes of that math, a bonus disc about a lost summer vacation is not filler, it is restitution. Watching Sou and the club occupy time that has no ticking clock attached to it hits differently once you know what October did to them. It shipped only to people who pre-ordered all six Blu-rays, which is exactly the crowd that needed it most.
After the autumn festival's strange events reshape everything, Sou and the Astronomy Club face an unexpected chance to reclaim what was lost. A mysterious phenomenon grants them access to the final summer before the old school building's closure, a season they never got to experience together. What should be a gift becomes complicated quickly. Revisiting moments that never happened means confronting what each member truly wanted from those months, and whether chasing a phantom past serves anyone's future. The group must decide if some memories are worth the cost of dwelling in them, or if moving forward means accepting that certain summers stay buried. This bonus episode deepens the romantic tensions and unresolved feelings that simmered beneath the main story's mystery. Character dynamics shift when given room to breathe outside the supernatural urgency that defined their first meeting. Sweet and melancholic in equal measure, it's a quieter chapter that values emotional honesty over answers, asking what happens when time gives you a second chance you didn't know you needed.