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 :

• Great Wooden Hammer (7 Days)

  Increase healing power of scrolls by 50%.
  Reduce 8 HP damage taken.
• Ink Cloud

  Additional 40 HP damage upon all attack.
• Puppet: Hakuki

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

  2011 Hanami Festival - Rhythm! Recover HP & CP by 10 every turn.
• 2011 Fortune Lantern

  Ninja Saga 2nd Anniversary Carnival!
• S47 Kami's Blessing

  Increase critical chance 6% and critical damage 10%.
• S8 Scroll of Golden Snake

  Increase all attack damage by 4%. Decrease damage taken by 4%.
• S14 Ancient Yabusa Knife

  Increases attack damage 4% and ignore 3% of targets dodge.
• 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.
• Decorative Rope
• Three-stringed Lute Guitar
• Ferret Tail
• Black Double Gun

  Ignore enemys dodge rate by 3%. Increase accuracy by 3%.
• Large Wooden Hammer
• Sakura wah

  Restores HP by 3% and CP by 99 each turn.
• S25 Musha Pipa

  Increase 4% critical rate and ignore 4% targets dodge.
• Shadow Umbrella
• Christmas Stick

  Increase 1% damage. Recover 3% HP with every Charge.
• Sealed Wood

  A back item which lost the original effectiveness.
• S69 Skull Cloak

  Increases Max. HP by 4%. Restores HP by 4%. Increase attack damage by 6%.
• Mech of Battle Gear

  Increase critical chance 3% and critical damage 8%.
• Nutcracker

  Increases Max. HP by 4% and damage by 3%.
• Ghost Spider

  Reduce 72 HP damage taken.
• S33 Book of Fate

  Increase Max. HP & CP by 4%
• S8 Sign of Corruption

  Wings with an ominous aura. Increases agility by 3.
• 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)
• Grave of the Undying

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