Taeko Hirukawa is introduced in episode 6. She is 17 years old at present time. The timing of events leads viewers to assume she is the granddaughter that the old woman is speaking about missing, but that turns out to be Midori.
As a recovered Ichi and Ushi run past her on the street she has a flashback to when she was younger. Then, Taeko's father rescued her from some bullies. Taeko's mother also appears in a flashback when she was graduating from elementary school.
She remembers her parents taking her to an arcade. She also remembers them arguing over whether to buy a new house so that Taeko could have a larger room for studying in school.
She claimed that she was happy being in the house she was born in. That opinion seemed to change as she grew older though. On her father's birthday, after they moved into their new house, she decided to set up a birthday surprise on his computer, but found a strange file instead. After looking through it, Taeko discovers that her father has installed a camera into her new room and had been secretly taking pictures of her undressing, which explains his fetish of being called "Daddy."