Kud Wafter is a spinoff of the original Little Busters! visual novel in which Kud is the main heroine. When, in the timeline, does it occur? Is it after Kud's route, or an alternative to Kud's route (i.e. after the common route) or in some other place in the story (e.g. after Refrain)? Of course, the name is a pun on "Wafu" (which Kud says frequently) and "After", but that alone doesn't seem to answer the question of how it fits into the main story.