When all of my relatives died after an airplane accident, the sole survivor who entered vegetative state is my female cousin, Mifuyu-chan.

To wake Mifuyu-chan up, I have acquired the knowledge of medical science. For 10 years, I have spent time everyday trying all possible means, but on that certain day, due to the influence of getting drunk, I violated the unconscious Mifuyu-chan.

Being charmed by Mifuyu-chan's body, I decide to use her as an onahole everyday.

However, Mifuyu-chan easily wakes up next morning.

8 year-old pure mind in a 18 year-old mature body.

This is a story of exploiting such an unbalanced beautiful, ignorant girl – Mifuyu-chan, to erot*c things.