Niki is your best friend. You have a good relationship... How good is it? It's the kind of relationship that is used to lying on the other's lap and often sleeping in the same bed. But you never thought of this day.

One day, just when you woke up from his bed and were about to wash up, you found that you... had changed back to the way you were five years old.

Now you, who are in the form of a baby, and Niki, who just woke up in a daze, looked at each other. Then, you found a note from his bedside.

"This is a witch's prank...~ But don't worry, honey, this prank will end in half a month at most, and you can change back to your original appearance in Half A MONTH."