In Bleach, Orihime Inoue had an accident when she was brought to Hueco Mundo by Aizen. During the distortion of time and space, 2/3 of her soul essence was forcibly extracted. The remaining soul stayed in Bleach to continue the plot of Bleach. The separated soul came to the world of Naruto, where she found confidence, found the other half of her life, and enriched her complete soul.
Note: Death and Naruto are two spaces that cannot intersect. This one-in-a-billion possibility may come from the gravitational force when the two spaces move to the shortest time together, forcibly attracting fragile souls. The separated soul cannot sense the remaining 1/3 of the soul.