Agree to stay with Mita.
You must complete the game once.
Start a new game and meet the following conditions:
In the prologue, do not look in the oven for Mita's brush.
In the next chapter, 'I'm Inside a Game?,' when looking for the battery in the refrigerator, pick up the magnets that fall.
In the next chapter 'Together At Last,' do the following: avoid looking inside the vent when getting the scissors, try the sauce when eating dinner with Mita, and play a console game with Mita.
When Mita asks you to stay, choose to stay.