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 :

• Tailed Beast Chakra Crystal

  Increase 3% damage.
  Reduce 3% damage taken.
  Recover 2% HP each turn start.
• Scroll: Double Head
• First-Aid Kit

  100% of the purchase price will be donated to Japan earthquake relief.
• Yatai Lantern
• Jaws

  Ignore 4% targets dodge.
• Scroll: Taiin
• S8 Ancient Scroll of Golden Snake

  Increase all attack damage by 4%, and Decrease damage taken by 4%. But reduce critical chance by 1%.
• Dark World Hammer
• Ninjas Stocking

  Increase 5% Combustion chance and attack damage by 3%.
• Puppet: Hakuki

  Increase 3% accuracy.
  Reduce 46 HP damage taken.
  Recover 83 HP when each turn start.
• Shadow Twin Blades
• Tail of Jyubi

  Forged with chakra of the legendary tailed beast, Jyubi. Increase attack damage by 15% but reduce max. CP by 30%.
• Ancient Shinobi War Decorated

  Additional 60 HP damage upon all attack.
• Orange Koi
• Paper Umbrella

  Increase dodge by 3%. Reduce damage taken by 80.
• S61 God Dragon Flag

  Increase critical rate by 6%. Has 20% chance to apply Restriction on enemies who attacks the user for 1 turn.
• S82 Amethyst Skull

  Increase purify chance by 5%. Recover 15% extra CP when charge.
• S78 Wandering Soul

  Recover CP after HP reduction. (Amount: 15% of HP reduction) Recover 15% extra CP when charge.
• Christmas Deer

  Increase critical chance 2% and critical damage 6%.
• S43 Extreme Lotus

  The back item contains 30% chance to absorb 3% HP of enemy which makes attack on you.
• Harvest Treasure Bag

  Reduce damage taken by 140. Recover 5% extra CP when charge.
• Sagittarius Hunting Set

  Increases dodge rate by 4%. Additional 80 HP damage on all attacks.
• Sand Gourd
• Death Wooden Coffin
• S8 Scroll of Golden Snake

  Increase all attack damage by 4%. Decrease damage taken by 4%.
• S42 Hanbing Hammer

  8% chance to convert damage taken to HP positively.
• Vertical Light

  Reduce 15 HP damage taken.