People's lives pass through many stages.
In childhood, they cross through ignorance with family love. In adolescence, they dispel loneliness through social interaction. In youth, they defeat ignorance through learning. In adulthood... Kagura Hikaru didn't grow up, so he doesn't quite understand.
In his previous life, he died as a middle school student, and in this life, he probably won't make it to high school graduation.
He is now in his 'youth'.
Youth is supposed to be about overcoming ignorance through learning; Kagura Hikaru thought so, but when he was in the hospital, hearing the doctor announce a disappointing result like "unable to diagnose the illness," and then seeing his father roar in anger, he couldn't help but feel there was still so much he didn't know.
At least, he had never seen his normally reticent father so emotionally charged, except for the day he exposed his mother's affair.
