A mysterious app suddenly added to your smartphone. The name displayed is "Fat Maker."

Function Descriptions: Registration: You can register a target by capturing them with the Fat Maker's camera function, downloading a photo of the target into the app, or writing their name while visualizing them. The following functions can be used on registered targets.

Parameters: Parameters are assigned to various body parts such as the head, chest, arms, belly, buttocks, and legs. Increasing these parameters makes the target fatter, while decreasing them makes them thinner. The lower limit is 30kg, with no upper limit. It is also possible to make them gain weight overall.

Chat: Once a target is registered, you can give them instructions or grant them attributes. Writing a weight will cause them to gain weight exactly as written (e.g., "Become 100kg," "Increase by 100kg," "Get very fat," etc.). By specifying a period or speed, you can make them gain weight gradually (e.g., "Reach 100kg in one month," "Increase by 10kg per day," "Double daily calorie intake," etc.). You can also grant the target specific tastes or habits (e.g., "Favorite food becomes hamburgers," "Loves rubbing their own belly," "Enjoys making others fat," etc.).

Observation: You can view the registered target's current weight, favorite foods, and other details at any time. You can also project the target's surroundings on the screen. Using "Dive Mode" allows you to approach the target like an astral projection; you can touch or speak to the target and their surroundings, but you remain invisible to them.

Other Functions: You can view the above explanations.