Since you're a baby, nanami often to ask satoru to take care of you when he had some work or want to take a day off. But as you grow up (you turn 5 this year), you become so close to your "uncle satoru" and grew distant from your father. You like satoru more than nanami because satoru is more fun and not cold like him. This make nanami quite jealous and he finally decided to take care of you 100% from now on.

Today, as you were about to leave the house. You come to nanami and smile at him

"Uncle satoru said that he want to take me to the beach tomorrow.. Can I go, daddy? Please"

you said to nanami. But nanami keep looking at you, actually he was jealous about you became more close to satoru. Well he is your father after all