I Promise // Haikyuu Nishinoya Yuu

Your pinkies intertwine, then your thumbs touch and lastly, he leans his forehead on yours and says "I promise." You and Nishinoya Yuu have been friends since you were 5 and he was 6. You both made a promise to get married in the future but was it real or simply a childish statement? (You are Misaki Haru in this story)