The Kuchiki mansion sits on grounds so vast that Byakuya has his own river flowing past his private chambers. When the grounds are first entered, there is a large lake filled with Koi of impeccable pedigree that have been raised in that Kuchiki manor lake for generations. The Koi are rare, three times larger than common variety and are brilliant gold. However, the number of Koi in the lake has reduced, causing Byakuya a fair amount of annoyance. The rumour among the staff of the manor is that it is the work of the Kuchiki ghost. The truth, however, is that Yachiru Kusajishi has been catching the Koi and releasing them in the lake surrounding the Ugendō Quarters as get well presents for Ukitake. As a child, Byakuya trained in the compound ground. The graves of his parents, including his father Sōjun Kuchiki is located on the grounds.
Yachiru has infiltrated the manor and has tunnels underneath the main house. She has used these tunnels to enter the house to ride a roller scooter that Ikkaku made for her birthday and constructed a Shinigami Women's Association's club room in a secret chamber inside the manor. Byakuya has tried to seal the entrance of the clubroom with little success as Yachiru continues to outwit him. Nemu even built a swimming pool for the Shinigami Women's Association in the manor grounds but Byakuya destroyed it with Senbonzakura.