Anime/K

Ka

 * Kantai Collection: Despite the fact that a giantess does not explicitly appear at all, the fact that the protagonists wear armor that looks like military bases gives the impression that they look like giantesses (i.e.: they are para-giantesses). And that's why this series is popular in the GTS community.

Ki

 * Kid Icarus Uprising: In these anime shorts, Medusa briefly appears as a giantess in Medusa’s Revenge.
 * Kiniro Mosaic - EP12: It's the final episode. For a brief moment, a giantess appears from the sea.

Ku

 * Kumo ni Noru: In a Buddhist heaven where saints fight over turf in the clouds, Nio-maru searches for the younger sister torn from him in an aircraft accident back in the human world. This anime only has 2 episodes and both episodes have GTS scenes.