A young girl has a precocious crush on her doctor, an adult man - she sees him as her first love, but he turns her down (saying "I'll consider marrying you once you're 16", though he is not serious, as she is dying from cancer and he only wanted to gently rebuff her as he is an adult.) The doctor later becomes a fan of a teen pop idol that his patient also enjoyed; he fantasizes about being in a relationship with her despite the age gap. When his coworker calls him out for pedophilic fantasies, he does not deny it after further pressing from his coworker. The same teen idol comes to his practice while she is secretly pregnant, hoping to get treatment in a remote location so that she is not recognized in public. She deliberately keeps the father's identity a mystery, but there is an implication that the father may have been an adult. After the doctor is murdered and the young girl passes away, both are reborn as the idol's twin children but still retain their past life memories. The boy (formerly the doctor) still struggles to see the idol as his mother, and as a teenager, it is heavily implied he still views her in a romantic way; the girl still seems to have a precocious crush on the doctor, not knowing he is now her brother. Later, the boy makes friends who joke that he has a "sister complex" because of how attached and protective he is of his sister, but he is not shown to have any sort of romantic feelings for her.