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 :

• Ink Cloud

  Additional 40 HP damage upon all attack.
• S42 Hanbing Hammer

  8% chance to convert damage taken to HP positively.
• Three Ring Magatama

  Increase 2% accuracy.
  Additional 12 HP damage upon all attack.
• Golden-bound Cudgel
• White Metal Hammer
• Karasu Miya Falcon

  Increase dodge rate by 6%.
• Mech of Battle Gear

  Increase critical chance 3% and critical damage 8%.
• S76 Buckler and Sword

  Increase max.HP by 12% but reduce max. CP by 2%.
• Love of coffee

  Prepared with love and empathy. Recovers 100 HP every turn. Increases attack damage by 4%.
• S13 Ancient Kishu Twin Blades

  Increase accuracy by 6%
• Mother's Hug (II)

  Recover 150 HP and 3% HP at the start of every turn.
• Scroll: Yinyang Seal
• Roasted Turkey

  Restore 20 HP every turn.
• Spinning Wheel

  Recover user's max HP by 1% each turn. Increases user's max CP by 2%. Converts 10% of damage taken into CP.
• Ninja Postman Bag

  Increase healing power of scrolls by 50%.
• Ronin Straw Hat

  Additional 100 HP damage upon all attack.
• Enternal Love Scroll

  Increase 5% Combustion chance and reduce 1% damage taken.
• Egg Hunter Basket

  Increase 6% accuracy. (Easter 2011 Limited Edition)
• 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.
• S74 Burning Wings

  Increases attack damage by 4% and Combustion chance by 25%. (Minimum requirement of 1 Attribute Point in Fire to activate combustion effect)
• Grave of the Undying

  Increase purify chance by 8%, but decrease agility by 15.
• Moai Flagon

  Increase Max. HP by 3%. Reduce damage taken by 100.
• Bell of Fortune

  6% chance to restrict enemy who attack user for 1 turn. Restriction target will not be able to use any skills.
• Ancient Shinobi War Decorated

  Additional 60 HP damage upon all attack.
• Little Shikigami

  Increases accuracy by 5%. Adds 80 damage in all of your attacks.
• Cursed Devil

  Increase attack damage by 15%. But reduce max. HP and max. CP by 10%
• Scroll: Kinjutsu I