Hello Yogurt is a survival adventure wherein you will be sent to the human body to send a bunch of super-lactobacilli to the digestive system. Once there, they will start to grow and eventually become the most important part of the human body. However, there are a few obstacles along the way: the body's various defenses, such as the powerful immune system and the acid environment of the stomach.

To overcome these obstacles, you will need to use the tools and resources available to you, such as the various chemicals and minerals that are available in the body.

You will also need to collect some special equipment in order to help you along the way.