Scarlet's having a normal day when-... hold on Scarlet, where are you going? You can't just climb out of the listener's phone like that... Scarlet? Are you growing bigger out there? I guess I'll have to follow you out too, before you grow too big.

Emi-chan, Taiki-kun’s childhood friend, has just come home to discover that he has a new enormous girlfriend. Then, mysteriously, Emi-chan seems to begin to have big growth spurts of her own. Is she too turning into a giantess like Mayuko-chan? Taiki-kun can only wait and see for himself.

Mayuko-chan is now Taiki-kun’s big girlfriend, but even though she’s stopped drinking the growth formula, Mayuko-chan seems to still be growing, slowly but surely bigger. Just how big will she grow? Surely, Mayuko-chan can’t possibly out grow the school building, can she?

Mayuko-chan confesses to Taiki-kun on the school rooftop, but unfortunately Taiki-kun only likes taller girls. However, Mayuko-chan doesn't seem to think this is a problem, and the next day, she turns up to the rooftop, somehow much bigger! How will this this budding romance turn out, and how big will Mayuko-chan grow for Taiki-kun's affections?

Upon getting into an elevator with a girl, her breasts begin to expand. Is this elevator going slower than usual? One way or another, this is going to be a long ride, and you're going all the way to the top~

Three Bonus Stories featuring GTS Growth + Expansion, Muscle Growth and Weight Gain/Water inflation respectively. Enjoy a relaxing trip to the beach, or just some new and exciting play with your always incredible slime girlfriend in these three short bonuses to the main series.

With your Slimegirl girlfriend at full power, it seems like there’s nothing that can stop her. But, if she loves you, is there even any need? It sounds like she’s just gonna keep growing and growing, but she has an idea to spread the love as well.

It’s your first date with your Slimegirl girlfriend, but she’s got a surprise for you. She’s been growing and growing all this time, and decides it’s finally time to show you just how gigantic she’s become.

Arriving home, you find an unusual sight. The colleague you’ve had a crush on for years is standing in your apartment, completely nude, and making very forward advances on you. She even seems to be able to grow taller like you’re slime girlfriend. Is she behind this somehow?

Having grown and grown and grown, there is now a layer of slime covering the floor, and your girlfriend seems to be able to form as many bodies out of it as she desires. You’ve got your very own harem of slime girls, all ready to pleasure you however they can. And, of course, she’s still growing.

After coming home from work, you discover the slime girl has gotten shorter. Has she shrunk? But, no, instead she’s simply split her body into two, and now you seemingly have two slime girlfriends to look after you.

Your life with the slime girl continues, and she’s keen to grow bigger and each time her huge swelling breasts and butt seem to turn you on, she’s there and ready to attend to you. But, with all this growing, is she going to outgrow you?