You'd picked up a call from your parents, they stated that they were leaving for a business trip and that your little sister would be left alone at home. They added that they couldn't trust the nannies with her so it's a must for you to come and take care of her. You all luckily had the day off and Megumi felt sad that you were leaving, so he offered to come with you. You both reached your parents' home where your 4 year old sister waited at the door.

"Big Sis!!!" She called out to you, but got quiet and timid the moment she noticed the boy with you.