When a life ends, its soul departs to its final resting place known as the Soul Society. However, if a soul is left to wander in the human world for too long, it ends up turning into a corrupted "Hollow" that feeds on other souls. In such cases, spirits called "Soul Reapers" are needed to eliminate the Hollows and guide the lost souls to the Soul Society.

Ichigo Kurosaki and Rukia Kuchiki are two Soul Reapers who are used to dealing with Hollows that appear in Karakura Town. But when they encounter the hostile "Blanks"—souls devoid of memories and immune to the "soul burial" used by Reapers—they are thrown for a loop. Senna, a fellow Reaper that neither Ichigo or Rukia are familiar with, comes to their rescue and manages to fend off the Blanks. The mystery deepens when a mirage of the human world suddenly appears over Soul Society. What could be the reason behind the strange phenomena, and how is it connected to Senna, who avoids any questions about her identity?

[Written by MAL Rewrite]

After a mysterious pair attack Rukia Kuchiki and erase her memories while she is in Seireitei, Ichigo Kurosaki, a substitute Soul Reaper, briefly forgets Rukia, until he is reminded of her by Kon, an Underpod Mod-Soul. Confused, he seeks his town's candy-shop owner, Kisuke Urahara, who opens the pathway to Seireitei for them. Ichigo is then shocked to find that his allies in Seireitei, the Shinigami of the Soul Society, have forgotten him.

Filled with action, Kimi no Na wo Yobu follows Ichigo and Kon as they fight against their former comrades while searching for the missing Rukia and discovering her assailants before they strike again.

[Written by MAL Rewrite]

"Hell" is the place where a person is sent to who committed violent crimes when they were alive. Shinigami are forbidden to go there. One day, prisoners revolt and make their escape to Karakura—the real world—where Ichigo and his friends live in. Ichigo and his friends are defeated one after the other by prisoners with overwhelming power. A mysterious man appears who comes to their rescue. With Kokutou leading the way, Ichigo, Rukia, Uryuu, and Renji marche into Hell to save the world.

Note: Episode 299 of Bleach serves as a prologue to this movie.

(Source: AniDB, edited)