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An alternate spin on the visual novel medium, usually with the same style of presentation but a more linear story that involves less decision-making or influence by the player.

Science-fiction. Commonly including things like aliens, advanced technology, and settings of outer space or distant planets. 

Work centered on following a character through the ups and downs during a notable part of their life. There's often more of an emphasis on characterization, relationships, and a series of dramatic events than on strict adherence to conventional story structures and plotlines.