These stories feature characters who are transported into another world, usually into a fictional one such as a novel, and are bound to a sentient, often non-metaphysical "system". The system is a program that dictates what the...
List of world hopping light novels (with some manga/manhua thrown in), mostly BL (not in any particular order). In these series, the protagonist is transmigrated into other worlds for some purpose, often to complete certain tasks...