Sci-fi, or science fiction, is a speculative genre which builds on imagination. Sci-fi anime ask, "what if things were different?" They explore a new world, whether it's the world of the future or past, a present Earth with a changed history, a land that was previously unknown, or another planet entirely. The genre commonly features humanity's inquisitiveness and innovation, as they grapple with new technologies, new societies, or new frontiers in Outer Space.
Shounen (少年), translated as "young boy", is a demographic aimed at boys and young men, from elementary school age to around the age of 15. Shounen is the counterpart of Shoujo, a demographic aimed at teenage girls.
In these anime, characters embark on a journey to explore the world or to search for something. These wanderers travel to many places and meet new people, often encountering hardships along the way, or discovering strengths and weaknesses about themselves that are revealed throughout the adventure.