Story :  "I decided that I wasn't going to let you get away a second time."

She's only with him to fulfill a contract, yet she slowly starts to fall for him...

"It feels good here, doesn't it?"

The potential marriage partner that Mizuho turned down without even looking at his photo just so happened to be the surgeon that she needs to plead with to perform her father's life-saving surgery.
Dr. Yoshizumi, in exchange for performing her father's surgery, asks Mizuho to move into his home as a live-in housekeeper. Mizuho accepts these conditions for the sake of her father.
However, the contract also includes being his partner at night!
Every night since then, Mizuho is embraced by Yoshizumi.
Her heart and body are exposed sweetly and sensually.
Throughout all of this, Mizuho is perplexed by the changes going on within her...