Bleach is a popular manga turned anime that tells the story of Ichigo Kurasaki and the Soul Society. Ichigo, born with the gift to see ghosts, becomes a Soul Repear in the first season when he saves his family from a Hollow . Thus he becomes a Soul Reaper, dedicating his life to fighting Hollows (dangerous lost souls) that prey upon innocent lost souls and innocent humans. As a soul reaper, it is Ichigo's job to free the lost soul and send it to Soul Society. Not only does he protect lost souls, but he protects the living innocent as well, particularly his younger sisters.
Ichigo gained his soul reaper powers from the Soul Reaper Rukia Kuchiki. It was this action that caused Rukia Kuchiki to be taken back to Soul Society by her own brother Byakuya Kuchiki and Renji Abari. She is then arrested and placed on execution orders by the manipulative Aizen Sosuke. Ichigo tried to stop Byakuya and Renji from taking Rukia, but was defeated and severely injured by Byakuya. Later on when he recovered, he found some of his classmates who were also spiritually aware and together they train under the soul, Shiba Kukaku, a personal friend of Yoruichi Shihoin.
Despite her violent streak and impatience, Ichigo and his friends train well under her, though it was Ichigo and Ganju (Shiba's brother) who were the brunt of her impatience. After they finished training and were ready to enter Soul Society according to Shiba, Yorouchi then leads Ichigo and his friends into Soul Society. They make their rescue attempt, though not without challenges after challenges until finally they succeed in rescuing Rukia who was currently waiting for her execution date to arrive.
It is later revealed that Aizen wanted Rukia executed so that he could gain her Hogyoku once it is removed from her body. This Hogyoku is an artifact that gives hollows Soul Reaper powers and vice versa.
Rukia does eventually lose the Hogyoku and Aizen and his accomplices flee Soul Society.