At the moment Kousuke went to meet Haruka, an explosion occurs! And suddenly, after the smoke vanishes, Kousuke finds himself in a world that takes place ten years into the future, accompanied by the voice of whom seems to be his best friend, Sarumaru, grieving it as a "failure". Manga adaptation of a stage play from the Japanese theater company, Caramelbox. It also includes an adaptation of "Hirokute suteki na Uchuu ja nai ka" (What a vast and wonderful universe!), a sequel to Ginga Senritsu.