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 :

• Stuff Bunny

  Increase Max. HP by 2% and Max. CP by 4%.
• Shigu Twin Blades
• Blue Crystal Wings

  Recover 15% extra CP when charge.
• Flame Blade Raijinco
• S71 Magic Clock

  Increases Max. CP by 10%. Recover CP after HP reduction. (Amount: 20% of HP reduction)
• S68 Supreme Faerie Wings

  Recover 20% extra CP when charge. Has 10% chance to convert damage taken to HP positively.
• S15 Frozen Large Sword

  Increase 7% purify chance.
• Vampire Cloak

  Increase healing power of scrolls by 100.
• Ronin Straw Hat

  Additional 100 HP damage upon all attack.
• Luckey windmill

  Each turn recover 120 HP and 120 CP.
• Screw Pattern Skis
• Mother's Hug

  Recover 100 HP and 2% HP at the start of every turn.
• Paper Envoy of God

  Increases attack damage and reduces damage received by 4%
• Bronze Torch of Zeus

  Increase mission XP reward by 200
• S61 God Dragon Flag

  Increase critical rate by 6%. Has 20% chance to apply Restriction on enemies who attacks the user for 1 turn.
• Iron Tortoise Shell

  Reduce damage taken by 200.
• Nutcracker

  Increases Max. HP by 4% and damage by 3%.
• Civet Cat Tail
• Carrot Time Bomb

  Has 8% chance to freeze enemy who attacks user (1 turn). Frozen target cannot move but damage taken is reduced by 80%. Has 5% chance to convert damage taken to HP positively.
• Ronin Idol

  Reduce damage taken by 100 and restores 4% of users max HP.
• S34 Wooden Name Tag

  Recover CP after HP reduction. (Amount: 20% of HP reduction)
• Holiday Doll

  Expecting Santa in every year! Critical and dodge rate increase 3%.
• Hide Guitar
• Umiyuki Painted Wood

  Reduce 24 HP damage taken.
• Spiked Blade

  Increases dodge and critical chance by 4%. Recovers 70 HP each turn.
• Pirate Skull Flag

  Increase 6% purify chance. Reduce damage taken by 5%.
• Scroll: Messenger

  Increase 2% accuracy.
  Reduce 20 HP damage taken.
  Recover 35 HP when each turn start.