Megumi Yamaguchi

When she was little, Mira Kinohata met a boy named Ao at a campsite in town. While gazing at the starry sky together, Mira learns that there's a star with the same name as herself, but no star named Ao. The two then promised to one day explore asteroids together and find a star to name it after him. Several years later, Mira enrolls at the Hoshizaki high school and decides to join the astronomy club to fulfill her promise. However, she learns that the astronomy club will be merged with the geological research society to form the earth science club. Reluctantly, Mira goes to the club room and is reunited with Ao Manaka-the person she made the promise to explore asteroids with-and is shocked to learn that she is a girl!

Five "Black Points" suddenly appeared around the world as portals to parallel worlds. Immediately after, strange creatures began their invasion from these portals. These creatures are the inhabitants of five worlds - the same worlds in different timeframes. In order to ensure their own future timeframe survives, each of the five invasion forces battle to wipe the other future timeframes out.

The main character Suzukaze Aoba graduates from high school and joins a game company. The person who made the game that Aoba loved as a grade-schooler just happens to be Aoba's senior at the company. The story follows girls who work and aspire at the Eaglejump company.