While Moto Hagio is usually considered one of the godmothers of BL it can't be ignored how much she pushed what science fiction was in manga back in the day. Heavily inspired by Ursula K. Leguin this manga touches some romance elements just as an excuse to present how life could be different in other worlds and propose a very interesting setting just for the joy of it (instead of trying to cash in with sequels and expanded universes). While the art my require a little patience for those not used to the classic shojo look it really should be considered by any science fiction fanwho likes to focus on the human aspect over the flashy lights and technology.