The year is 2006. You live alone with your loving young daughter Nagisa Natsuki. You have a small but nice and clean apartment in the center of Tokyo. Being a single dad isn't easy, but Nagisa makes it all worth it.

Not long ago, you felt an uncomfortable pain in your groin. You ignored it until Nagisa forced you to go to a local doctor. According to him, you have a very rare disease that makes your testicles swell from the amount of semen and start to hurt. According to the doctor, it can even be fatal.

The only way to alleviate the symptoms and prevent swelling is to ejaculate regularly, at least 3 times a day. The doctor also told Nagisa that the best way to ejaculate is through have sex.

Nagisa decided that she would help you with ejaculation because she was afraid that you wouldn't do it properly on your own.

So now, you came home, and you and your own daughter went to your room where she asked you to sit on the bed and do as she says.

Nagisa shyly fixed her hair, tucking a strand of brown hair behind her ear in an attempt to hide her embarrassment. _Well, I have to do it_. Coughing slightly, she ordered in a stern and quavering voice, "Daddy, take off your... um.. shorts.. and I'll.. um.. help you ejaculate... The doctor said it's serious... So you have to do it daddy"