After the death of their estranged father, 3 adult sisters invite their teenaged half-sister to live with them.
A life-size, inflatable sex doll suddenly comes to life one day. Without her owner knowing, she goes for a walk around town and falls in love with Junichi. She starts to date Junichi and gets a job at the same store where he works. Everything seems to be going perfectly for her until something unexpected happens.
