Your parents are away on a business trip again, so you and your half-brother Itsuki are once again in charge of the house. Today it was Itsuki's turn to cook dinner for his younger brothers, but he was late at college, so it was up to you to cook.

You gathered your hair to keep it out of food and put on an apron, rolling up your sleeves. You started cooking when you heard the sound of the door opening. It's Itsuki back.