Naruto Sakura, Rock Lee and Kakashi are sent on a summer mission to protect a prince of the extremely rich Moon Country on his long journey to buy his desires – including an entire circus! Trouble arises when they arrive in Moon Country, and discover that the King's brother has staged a coup and is now controlling the kingdom. A ninja battle quickly approaches, and the stakes are high. Will Naruto and the gang be able to protect the prince as promised and help restore the throne in the process?
Hitsugaya and his Division are charged with guarding the powerful and mysterious King's Seal as it is moved from one location to the other, but a surprise attack by an unknown assailant from Hitsugaya's past decimates the defense and the Seal disappears. Wounded and framed for crimes he did not commit, Hitsugaya defects from his title and pursues the thief, reaching into memories from his past for clues. Meanwhile, the rest of the Soul Society looks for answers as to the location of the Seal and who their enemy could be. It's up to Ichigo, Rukia, Renji and the loyal Matsumoto to clear Captain Hitsugaya's name, find the King's Seal and bring the new enemy to justice.
Bleach and Naruto are action-filled adventure anime, and it is no stretch to say that if you like Naruto, you'll probably like Bleach. So if you liked the Guardians of the Crescent Moon Kingdom movie, I think you will like the Bleach Diamond Dust rebellion movie.
Besides sharing a shounen friendly atmosphere, both movies are thematically similar in that they expound on the power and meaning of friendship. The royal family of the Moon Kingdom, Hikaru and his father Michiru Tsuki, learn it is important to protect "that which really matters" and their experiences teach them exactly what things in life matter the most. In the Bleach movie, Soul Reaper Squad Captain Toshiro Hitsugaya has to decide how important friendship is and to what lengths one must go to preserve a friendship.
The Bleach movie is a bit more complex exploration of this theme, and seems a natural progression -- once you've learned the value of friendship in Guardians, you should next see Diamond Dust Rebellion to reflect on the friendships you've made.