Jungle de Ikou!

Jungle de Ikou! is a Japanese anime OVA collection produced by Movic.

It only has 3 episodes, and all of them has relative GTS scenes.

Synopsis
After meeting a dancing old man in what she thinks is just a crazy dream, a preteen schoolgirl embarks on a series of fanservice-filled magical girl adventures with a little creature named Ongo who might be evil and a shy girl with mysterious powers named Nami.
 * Source: https://myanimelist.net/anime/2524/Jungle_de_Ikou

Featured perfect ultra-giantess: Mii

 * 1) Mii is the goddes of flowers, fertility and reproduction.
 * 2) When she must face the God Of Destruction (a kaiju), she increase her size and power.
 * 3) Jungle de Ikou! - EP3 was the only episode where she was a perfect ultra-giantess.

Featured para-giantess: Natsumi Rokudo

 * 1) She is the protagonist.
 * 2) Jungle de Ikou! - EP1, she briefly interacts with a shrunken Ahem (God of Creation).
 * 3) Jungle de Ikou! - EP2 and Jungle de Ikou! - EP3, she interacts with a shrunken Ongo (God of Destruction), caged into her crystal pendants.