Honest to god best thing to do is to quit now before you get too invested. If you wont be dissuaded though, there is a guide somewhere in this thread I think (real helpful I know), but I *highly* recommend putting your gamer pride aside and playing on easy- normal mode just aint worth it, it's plenty frustrating on easy too. The first girl, boobs, goes from her house to the school to a cafe, the school being the futa's hunting grounds, the cafe being a maid lady's domain. The futa will go to her house, where you can crawl into her mother's ass, who'll take you to a dance club, where you can get inside a fairy (I think she has green hair and is near the right-most side of the building). And I think that's all five girls, there's a bathhouse as well but I think it's used exclusively by the fairy.
Look around the various environments, you can pass time outside of giantesses by finding a place to enter and sleep in, which will change which giantess is around-they're hard to find if your game randomly zooms in with no way of zooming out, anther reason to just drop this game tbh.
