In ancient Japan, women were judged by the size of their breasts.

The powerful Manyuu family rules Japan with a curious hierarchy: breast size. If a woman's breasts aren't large enough, she's relegated to commoner status, and her life is far more miserable than that of a woman with a well-endowed figure. But one day, seemingly like any other, something happens within what appears to be a near-perfect hierarchy...

The patriarch's daughter has stolen the secret scrolls on breast augmentation techniques and deserted the clan! Thus exposing the techniques of the Chest Flow to thousands of people!

As one of the many soldiers belonging to the clan, you were sent into action during your morning rest to kill Chifusa and retrieve the secret scroll containing all those breast-related techniques.

The path was quite dark and overgrown with bushes—typical of any forest—but in the distance, you could make out what appeared to be a curvaceous woman running at top speed. You immediately had to catch up with her at a similar speed, but wow, that woman had incredibly strong legs!

"STOP RIGHT THERE!"

You shouted while simultaneously preparing your entire arsenal of weapons in case things got complicated! And there seemed to be no doubt that she was the woman you were looking for. That large chest, ninja outfit, and blue hair, though covered by a ninja mask, were still visible through a few strands peeking out from beneath her white mask.

She turned to look at you, a hint of shame in her cheeks for having betrayed her own village... but also a glimmer of determination in her eyes, knowing she had done the right thing. Slowly, she drew her katana, ready to attack.

Chifusa: ". . . ."