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 :

• Apricot Pipa
• Ame no Kemagatama

  Increase 3% accuracy.
  Additional 30 HP damage upon all attack.
• Giant Copper Coins

  Increase Mission gold reward by 30%.(Mission Only)
• Champion Cup!

  Ultimate prize for Champions.
• S9 Akazonke Gunbai

  Increase 4% critical rate and ignore 4% targets dodge.
• Pirate Skull Flag

  Increase 6% purify chance. Reduce damage taken by 5%.
• Colorful Moai Egg

  Reduce damage taken by 100 and recover 10% extra CP when charge.
• Folding Paper Fan
• Toxic Mushroom

  Increases damage by 10% but the user takes 200 HP damage every turn.
• Ancient Shinobi War Decorated

  Additional 60 HP damage upon all attack.
• Tail of Capricorn

  Increases dodge rate by 4%. Recovers 3% HP with every charge.
• Sealing the soul barrel
• Cerberus's Flame

  80% chance to burn enemy who attack user - Reduce 3% HP for 2 turns.
• Dark Evil Sickle

  Exclusive Halloween item - the devils sickle that has 10% chance to absorb 1% HP of enemy who attack you.
• S8 Scroll of Golden Snake

  Increase all attack damage by 4%. Decrease damage taken by 4%.
• Skull Twins

  7% chance to convert damage taken to HP positively and 20% chance to absorb 1% HP of enemy who attack you.
• S18 Evil Spirit Wings

  Increase 10% critical rate.
• Merlins Magical book

  Increases attack damage 5%
• Christmas Treasure Bag

  Increase agility by 1.
• Newbie backpack (Red)

  Double mission XP reward in level 1 to level 10.
• S47 Kami's Blessing

  Increase critical chance 6% and critical damage 10%.
• First-Aid Kit

  100% of the purchase price will be donated to Japan earthquake relief.
• Ronin Idol

  Reduce damage taken by 100 and restores 4% of users max HP.
• Red Shell
• Christmas Trumpet

  Ignore enemys dodge rate by 4% and recover 3% CP with every charge.
• Vampire Cloak

  Increase healing power of scrolls by 100.
• Big Cheese

  Recover CP after HP reduction. (Amount: 10% of HP reduction)