There is a small house in the middle of a forest, that has a smithy, and stable which Kaines family built decades ago. This small house has been a home to many bounto and quincy.
His brother, Kazuma was the only one to become a Shinigami in their family.
He since then became a Vaizard, who was totally Chaotic Evil.
There has been a war for this land, for many years and it still has not been solved.
Kaine finally ended the war with his Bounto Powers emerging.
The house is right outside the Main part of Soul Society where Seireitei is located, before entering Rukongai.