Secret Promise Under the Blue Sky

In the park after school, two high school girls lean on each other. The long-haired girl gently places her hand on her best friend's shoulder, sharing dreams of the future with the fountain's water as background music. Despite attending different schools, as shown by their uniforms, this spot by the fountain is special. Today, a small adventure seems about to begin. The refreshing breeze envelops their bond—what story awaits them?