Sixteen years after Yakumo 's death , Shinnosuke is training to become a shin'uchi , his younger sister Koyuki begins high school .
Konatsu has established herself as the first ever female shin'uchi .
Sixteen years after Yakumo 's death , Shinnosuke is training to become a shin'uchi , his younger sister Koyuki begins high school , and Konatsu has established herself as the first ever female shin'uchi .