《Haikyuu!!》 Kageyama Tobio indeed has an older sister: Uncovering "Miwa's" identity and her influence on Tobio
In the beloved sports anime "Haikyuu!!", the genius setter of Karasuno High School, Tobio Kageyama, has deeply impressed fans with his aloof yet dedicated image. While many fans follow his growth on the court, they are also often curious about his family background. In fact, Tobio Kageyama does have an older sister, and her name is Kageyama Miwa (影山 美羽).

Kageyama Miwa: An Early Guide in Tobio's Life
According to official information and manga plot reveals, Kageyama Miwa is Tobio Kageyama's older sister, nine years his senior. She played an important role during Tobio's childhood. From a very young age, Tobio Kageyama was exposed to volleyball along with his sister and their grandfather, Kazuyuki Kageyama. There is even a plot point mentioning that Tobio was biting his sister's volleyball before he was even one year old. This suggests that volleyball was passed down through the Kageyama family and might have been the starting point for Tobio's strong interest in volleyball.
Miwa and their grandfather often took the young Tobio to the gym to practice volleyball. Tobio's grandfather was the coach of a mothers' volleyball team and was also an important mentor. Although Miwa later gave up volleyball because she wanted to grow her hair long, her influence on Tobio's early exposure to volleyball, along with the family's love for the sport, undoubtedly laid the foundation for Tobio becoming a top volleyball player in the future.

The Sister's Presence and Current Status in the Story
Although Kageyama Miwa does not appear frequently in the main storyline of "Haikyuu!!", being mentioned mainly in Tobio Kageyama's memories or background settings, her existence adds depth to Tobio Kageyama's character development. She is currently known to be Tobio Kageyama's only sibling.
As an adult, Kageyama Miwa became a hairstylist. This also explains why she chose to quit volleyball after high school, as she did not want to cut her hair short for volleyball training. Although she does not directly participate in her younger brother's volleyball career within the story, as part of Tobio Kageyama's family, she is an important element in constructing his personal worldview.
In summary, Tobio Kageyama indeed has an older sister named Kageyama Miwa. She was not only a witness and participant in Tobio's childhood volleyball enlightenment but also adds a warm touch to the family background of this genius setter.
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