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 :

• Nutcracker

  Increases Max. HP by 4% and damage by 3%.
• S11 Wood Spirit's Bow

  Increase critical chance 13%.
• Holiday Doll

  Expecting Santa in every year! Critical and dodge rate increase 3%.
• 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.
• Scroll and Blade

  Has 11% chance to restrict enemy who attack user for 1 turn. Restriction target will not be able to use any skills. Increase critical rate by 5%. 8% chances of using Jutsu without CP.
• Prestige Purple Dragon

  Increase attack damage by 5%. Recover 100 HP at the start of every turn.
• Universal Backpack

  Increase healing power of scrolls by 100%. Each turn recover 140 HP.
• S8 Scroll of Golden Snake

  Increase all attack damage by 4%. Decrease damage taken by 4%.
• Tail of Jyubi

  Forged with chakra of the legendary tailed beast, Jyubi. Increase attack damage by 15% but reduce max. CP by 30%.
• Sealed Wood

  A back item which lost the original effectiveness.
• S8 Ancient Scroll of Golden Snake

  Increase all attack damage by 4%, and Decrease damage taken by 4%. But reduce critical chance by 1%.
• S72 Hero Twin Axe

  Increase 12% Combustion Chance and recover 3% HP at the start of every turn. (Minimum requirement of 1 Attribute Point in Fire to activate combustion effect)
• Charming Aura (Red)

  2012 Valentines day limited aura, increase all damage 2%.
• Dark Secret Seal

  Increases critical chance by 4%. Has 12% chance to Restrict anyone who attacks the user.
• Shadow Twin Blades
• S8 Underworld Bulwark

  A phantom shield with demon soul. Reduce damage taken by 10%.
• S36 Wind Chakra Magatama

  Increase accuracy by 3% and dodge rate by 3%.
• Christmas Trumpet

  Ignore enemys dodge rate by 4% and recover 3% CP with every charge.
• Puppet: Hakuki

  Increase 3% accuracy.
  Reduce 46 HP damage taken.
  Recover 83 HP when each turn start.
• Gunbai: Gyoji
• Pirate Skull Flag

  Increase 6% purify chance. Reduce damage taken by 5%.
• Assault Kite

  Recover 100 HP and 80 CP at the start of every turn.
• S77 Curse Dragon

  Increases attack damage by 9% and critical damage 10%.
• Moai Flagon

  Increase Max. HP by 3%. Reduce damage taken by 100.
• S57 Magatama Gunbai

  Increases dodge rate by 5% and restores 4% of users max HP every turn.
• S25 Musha Pipa

  Increase 4% critical rate and ignore 4% targets dodge.
• Ramen Shop Lantern