We met the main character Ichigo Kuroaski, a boy that has the ability to see spiritual figures. His life changes when he meets a Soul Reaper (Shinigami) named Rukia Kuchiki, that is doing her job in tracking and slaying a spirits named Hollows. Well tracking one, she ends up in Ichigo's room.
After a brief conversation, the hollow Rukia was tracking attack the Kuroaski house. Wounded Ichigo's sisters Karin and Yuzu. Rukia tries to slay it, but Ichigo gets in the way and Rukia protect Ichigo, but injuring her self to the point she can't fight, she transfers her powers into him, and thus beings the story.