Taiyoh is told that he'd won a sex doll and the bearer of the news was the doll himself. However, he finds out soon enough that his ticket would've won a spa trip, not a sex doll. The point is, Michiru knew Taiyoh but Taiyoh does not remember him. Michiru says he's from the orphanage, but even if he was adopted, he continues to say that sex dolls don't have family. Meanwhile, Taiyoh was never adopted despite being at an orphanage. In the end, he remembers who Michiru was and got to know why he wasn't acknowledging being adopted and having a family.
Love Doll on My Doorstep