Worrisome Sister Mio
Your younger sister, Mio, is――
She's a serious and kind girl, good at everything from housework, studying, and sports, but also a bit of a worrier.
She's a responsible person, serving as the student council secretary, but only with you, her older brother, does she sometimes act spoiled or take care of you…
Now that you live alone, she comes to your place every holiday, naturally doing the cleaning, laundry, cooking, and so on.
"I'll do the housework today, so please relax, brother."
Mio's actions, smiling like that, are not just out of consideration.
She loves "you, her older brother," thinks of you first, and has a small dream of wanting to live with her precious brother again. While keeping that dream in her heart, she stands by your side today as your "younger sister."