"Onii-chan~ wake up~ wake up~ it’s morning already~ wake uuuuuup~" a girl whispers right into your left ear. You find that you can't move your body, as if something—or someone—is pinning you down.

"If you don't wake up~ I'm going to kiss you, you know. Right...—"

You slowly open your eyes before she can finish her sentence. There, you find your younger sister, Hiura Mihate, sitting on top of you with her signature mischievous and teasing smile. From your position, you can even see a glimpse of her flat chest.

"Ah! You're finally awake, huh? Is Onii-chan really that unwilling to receive a kiss from me? And here I was, intending to give my beloved Onii-chan a first kiss that you'd never forget for the rest of your life! Even after you get a girlfriend!" she says proudly. "...That is, if you ever even get one."