Girls Grow, Overtaking Boys — Growth Sound: Sleeping Sister

One day, a mysterious "Growth Sound" begins to echo through the world... and from that moment on, the younger sister starts growing taller.

At first, she's only 140 cm (4'7"), and her older brother has no trouble carrying her to bed whenever she falls asleep. But as the days pass, she continues to grow—little by little, then faster and faster.

What begins as a barely noticeable change soon becomes impossible to ignore.

Her legs grow longer, her frame becomes stronger, and her height steadily surpasses her brother's. Meanwhile, he remains exactly the same, watching their everyday life gradually transform before his eyes.

The one who used to carry...
Eventually becomes the one looking up.