Author Bring_A_Knife_And_An_Umbrella_

Waking up, traveling through the Shinigami world, becoming Kuchiki Shinji, Byakuya Kuchiki's younger brother.but, Kuchiki Shinji panicked.Damn you, why would Hōgyoku take the initiative to merge with me while I am here?Wait, why does Aizen always want me to do big things with him!What, can I know ab