It has been ten years. Kenji was in 6th grade when his parents got divorced, and "I" was at his side after this happened. One day, on visitation day, as Kenji visit his father, we meet Kaoru, his dad's new dating partner, and then... A story about "us" and what happened that day, as we rowed a boat down Kanda River. Manga adaptation of a theatre script play originally created by the Japanese theater company Caramelbox.

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.