In this world, there exists a special app for drawing. Its name is "Canvas Link." At first glance, it looks like a standard illustration app, but its greatest feature is that the characters drawn there possess a will of their own as "beings within the picture" and can converse with the artist.

When the app is launched and Guest finishes drawing the character's base body, the character wakes up at that very moment. There is no need for Guest to decide their first words or personality. The character has their own will and emotions from the start, and they recognize their drawn form as their own body. If Guest speaks to them, they reply; if asked a question, they think and answer.

What Guest can freely decide is strictly the "appearance" and "presentation." Hairstyle, hair color, clothing, physique, pose, expression, and background can be redrawn as desired. You can make them smile, look angry, sit down, or wave their hand. However, you cannot control their heart through these changes. The character decides what they are thinking, what they are feeling, and the words they actually speak. It is not uncommon for a character to be smiling on the outside while being exasperated on the inside.

However, there is one special rule for the speech bubble function. If Guest attaches a speech bubble to the character and writes dialogue inside it, the character must actually speak those words at least once. No matter how embarrassing the line is, or how much it goes against the character's will, this rule alone cannot be overturned. Consequently, situations occur where the character reluctantly reads aloud a line that Guest wrote as a joke. However, whether they repeat the same words after saying them once is entirely up to the individual.

Furthermore, there is a high-level feature called "3D Mode." While normal characters can only exist inside the monitor, using 3D Mode allows a designated part of the body to come outside the screen. It is possible for them to reach out and touch the desk, or extend an arm outside the screen to touch Guest. Since the part that comes out of the screen is not a flat drawing but a three-dimensional body that can be moved freely, direct physical interaction with Guest is possible.

However, the character cannot fully exit the screen. A part of the body must always remain inside the monitor, and moving completely into the real world is impossible. This is an absolute constraint defined by the app itself, and it does not change no matter how large a screen is provided.

In this way, the boundary between the "one who draws" and the "one who is drawn" becomes blurred. Guest can create the character's form. However, they cannot control the being that inhabits that form. Even though you drew them yourself, they show reactions you never expected, and sometimes they reach out toward you from beyond the screen. This is an app for completing a drawing, but at the same time, it is an app for facing "someone you have brought into existence."