Yochou no Miku -Choukyou no Hate ni | 夜蝶の未来 ～調教ノ果テニ～

Protagonist Morimiya Kei that made to bear a debt in the rip-off Sex Service shop, in owner's arrangement, he will work as a manager for the pretty girl Miku at the shop.

Miku carries parents huge debt, she was prepared that the body was prostituted as Miss Sex Service for the sake of the repayment. Protagonist such pitiful brave Miku, it is ordered to bring up Miku into a female worker for first-class Sex Service.

What ending waits for the two who have just met...