Big Sister

Big Sister was one of Kanahebi's first mangas uploaded on Internet.

The objective of this manga was to explore the majority of possible GTS tropes in an organic history (that is, not to feel forced).

Plot
An alien species (perfectly human looking) arrives on a relatively smaller planet with inhabitants (also perfectly human looking) much smaller.

Of the first species mentioned, there are 2 protagonists: Ruri and her big sister. Ruri arrives in this small planet, but does not realize that she is in the middle of a city and initially confuses buildings with boxes. On the other hand, the big sister must look for her lost sister. Throughout history, the 2 sisters cause destruction and havoc throughout the city, resorting to many popular GTS tropes of the time (2008).

Trivia

 * Being the Kanahebi's first mangas, its production was done in a traditional way (on paper).
 * It can be noted that Kanahebi, being still an illustrator with little experience, drew the relative sizes inconsistently: sometimes the giantesses seemed 30 meters tall and others seemed 200 meters tall.
 * Kanahebi never left clues to know the absolute sizes of the characters, so we do not know if the 2 protagonists are absolute giantesses or para-giantesses or any other type. Therefore, we must rely rather on the concept of relative giantess, which is the concept on which the definition of giantess fetishism is based.