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.
• Three-stringed Lute Guitar
• Carp Flag
• Silver Torch of Zeus

  Increase mission gold reward by 300.
• Puppet: Hakuki (7 Days)

  Increase 3% accuracy.
  Reduce 46 HP damage taken.
  Recover 83 HP when each turn start.
• Ronin Idol

  Reduce damage taken by 100 and restores 4% of users max HP.
• Puppet: Hakuki

  Increase 3% accuracy.
  Reduce 46 HP damage taken.
  Recover 83 HP when each turn start.
• Wood Top
• Flag: Dragon Symbol
• Pirate Skull Flag

  Increase 6% purify chance. Reduce damage taken by 5%.
• Christmas Bag

  Reduce damage taken by 10.
• Scroll: Genbu
• Raijin Raijinco
• 2011 Carnival Jiegu

  Ninja Saga 2nd Anniversary Carnival! Each turn recover 100 HP and 100 CP.
• Soul of Egg Hunting Beast

  2012 Egg Hunting Event
• Flag of the Burning Legion

  Reduce 3% damage taken and 12% chance to absorb 2% HP of enemy who attack you.
• Shadow Twin Blades
• Jaws

  Ignore 4% targets dodge.
• Ocean Ring

  Increase 1% accuracy.
  Additional 2 HP damage upon all attack.
• Colorful Moai Egg

  Reduce damage taken by 100 and recover 10% extra CP when charge.
• Cheerful Snowman

  Increase Max. CP by 20%. Recover 2% HP at the start of every turn. but reduce max. HP by 12%.
• 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.
• Bat Back Item

  Back item design with reference from Halloween - Bats. Increase 5% dodge rate and decrease damage 5% at the same time.
• Blizzard

  Increases users agility by 1. Has 7% chance to convert damage taken into HP.
• S29 Yanki Protective Magatama

  Increase accuracy by 8%
• Umiyuki Painted Wood

  Reduce 24 HP damage taken.
• Angel Heart (Black)

  Reduce target 8% CP on every weapon attack.