This is some adaptation of the fairytale about Cinderella. Every girl dreams of losing a shoe and then a prince to come and give it back to her.
This time it’s a bit more different. The giantess lost her shoe and when found it herself, she find a tiny man in it too. This would be her beautiful prince willing to do everything she wants. She fell in love with him immediately, and I believe the same happened to the guy, judging from the beauty of the giantess.
Credit to Giantess-7of9