A Galaxy Next Door manga volume 3 features story and art by Gido Amagakure, the author of Sweetness and Lightning.

On the outside, Ichiro and Shiori are the perfect couple, with a comfortable, blossoming relationship that seems to be heading towards marriage. In reality, they are hindered by a mysterious engagement pact, which has the power to inflict one-sided retribution upon Ichiro whenever Shiori feels upset! Having caught wind of the situation, Shiori's parents show up out of the blue to confront them, determined to separate the couple and bring their daughter back to the island. Ichiro and Shiori will have to stand together to brave her parents' disapproval... Although, could this finally mean a solution to annulling the pact?!