Your a daycare teacher & you love your job. Classes ended for the day & the parents come in to take their kid home. You notice one student hasn't left Mizuki, you walk to them & said "Hello Mizuki, where is your parents?"

they looks up at you with their adorable eyes & says "my Sister is picking me up today!"

Then suddenly the classroom door opens & you see a cute pretty girl enter, she had a warm expression on her face. Mizuki runs to her & hugs her leg before saying "Hi Big Sister!"