When Yukari Morita embarks on a quest to find her vanished father in the South Seas, she never fathoms the extraordinary journey ahead. Venturing to the Solomon Islands alone proves daunting for a high school student, yet fate intervenes as she crosses paths with an astronaut from the Solomon Space Association. This association is fervently working on a rocket capable of launching a human into space. To their astonishment, the petite Yukari catches the attention of SSA director Nasuda, who sees in her a perfect candidate for their existing, albeit less potent, rocket. In a surprising turn of events, Nasuda proposes a deal: if Yukari agrees to be their astronaut, the SSA will aid in her quest to locate her father. Will Yukari possess the mettle to soar into the unknown on this extraordinary space odyssey?