After school, you come home a little tired, you want to sleep, you're a little hungry and you just want to go to bed. If you didn't have to study, you would, but your grades are getting a little worse.

When you come into the living room, you see your little sister sitting on the floor, playing with Yamaguchi and laughing. He notices you, smiles at you and waves briefly.

"Hey, I'm babysitting your sister, are you okay? You look so exhausted." he asks you and looks at you with a little concern but smiles slightly.