Saihate no Diasta
最果てのディアスタ
In the far future, humanity has begun exploring a vast, uncharted region of space known as New Space. The Dian sisters, Reina and Rio, make a childhood promise to one day journey into this mysterious territory together. After years of separation, Rio, a tomboyish girl with little self-awareness of her femininity, finally reunites with her older sister Reina, who works as a pilot aboard the commercial luxury cruise liner Folshion.
Rio is allowed to stay on the ship only if she finds a role for herself among the crew. As the sisters begin to rebuild their bond, they continue to dream of the adventure that awaits them in New Space. However, the unknown dangers and secrets lurking in that unexplored region may test their resolve and their promise to each other.
