You might as well compare with these Back Items so you can decide which Back Items you're gonna use for ninja Saga Pvp or in Hunting House for easier killing the boss or your opponent in ninja saga PvP
These Back Items might have better effect . Here we go :

• Tail of Hachibi

  Forged with chakra of the legendary tailed beast, Hachibi. Increase critical chance by 15% but reduce max. HP by 20%.
• Scroll: Tenku
• Justice and Freedom

  Flag of the United States of America which symbolizes freedom and liberty. Recover 3% HP with every charge. Increases critical rate by 3%. Reduces damage taken by 50.
• Clear Cross

  Increase 3% purify chance. Each turn recover 150 HP and 150 CP.
• Native Horn

  Increase max. CP by 3%, Recover 1% HP with every Charge.
• S77 Curse Dragon

  Increases attack damage by 9% and critical damage 10%.
• Fathers Treasure

  2014 Fathers Day special back item. Doubles the TP reward from TP missions.
• Puppet: Hakuki (3 Days)

  Increase 3% accuracy.
  Reduce 46 HP damage taken.
  Recover 83 HP when each turn start.
• S65 Transcendent Flame Wings

  Remnants of a powerful fire spirit. Increases attack damage by 7% and increase 20% Combustion chance. (Minimum requirement of 1 Attribute Point in Fire to activate combustion effect)
• Hanami Taiko

  2011 Hanami Festival - Rhythm! Recover HP & CP by 10 every turn.
• Fire Symbol Guitar
• New Year Kadomatsu

  Recover 100 HP and 100 CP at the start of every turn.
• Force of Taowu

  Increases Max. HP by 4% and Max. CP by 4%.
• Three Ring Magatama

  Increase 2% accuracy.
  Additional 12 HP damage upon all attack.
• Shoe of Bounty

  Increase dodge rate and critical rate by 4%.
• Carnival Taiko

  Play the Taiko in Ninja Saga Anniversary Carnival! Recover 5 HP and CP at the start of every turn.
• Little Shikigami

  Increases accuracy by 5%. Adds 80 damage in all of your attacks.
• Decorative Rope
• Drum: Ako
• S42 Hanbing Hammer

  8% chance to convert damage taken to HP positively.
• Stuff Bunny

  Increase Max. HP by 2% and Max. CP by 4%.
• Deadwood Pipa
• S20 Empire Battle Gear

  6% chance to convert damage taken to HP positively.
• Clouds And Mist Raijinco
• S58 Scroll of Shadows

  Increases damage by 6% and dodge rate by 5%.
• Scroll: Rikugo
• Taurus Wand

  A necromantic wand with a figurehead of a bull. Used by necromancers in ancient times to amplify their power. Recover 100 HP at the start of every turn. Has a 12% chance to absorb 3% HP of enemies who attack you.