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 :

• Tail of Hachibi

  Forged with chakra of the legendary tailed beast, Hachibi. Increase critical chance by 15% but reduce max. HP by 20%.
• Mech of Wing

  Reduce damage taken by 10%.
• Smart Phone
• Puppet: Hakuki (7 Days)

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

  Reduces damage taken by 3%. Converts 9% of damage taken into CP.
• Tail of Capricorn

  Increases dodge rate by 4%. Recovers 3% HP with every charge.
• Turkey Tail
• Bell of Beast

  Recover HP by 3%. 15% chance to absorb 3% HP of enemy who attack you.
• Sakura Gold Jewellery

  Increases users agility by 1. Restores 3% of users max HP. Has 6% chance to convert damage taken to HP positively.
• Scroll: Flying Phoenix
• Sakura Rain Battle Umbrella
• Champion Cup!

  Ultimate prize for Champions.
• GM Goldfish

  GM Goldfish
• Christmas Deer

  Increase critical chance 2% and critical damage 6%.
• Victorious Crown

  Increases accuracy by 4% and recover HP by 3%. Has 13% chance to restrict enemy who attack user for 1 turn. Restriction target will not be able to use any skills.
• Wooden Repeating Crossbow
• Folding Paper Fan
• S23 Meschiken

  Recover CP after HP reduction. (Amount: 20% of HP reduction)
• Dark Blade

  Increase 2% critical rate and ignore 2% of targets dodge.
• Spiked Blade

  Increases dodge and critical chance by 4%. Recovers 70 HP each turn.
• Sakura Fan

  Recover 20 HP and 150 CP at the start of every turn.
• Red Shell
• Christmas Treasure Bag

  Increase agility by 1.
• S32 Black Senbu

  Recover HP by 4% and reduces damage received by 3%.
• S9 Warring Empire Guarding Bow

  An ancient enchanted bow with great range used in warfare. Increases accuracy by 10%. Restore 100 HP every turn.
• S15 Frozen Huge Sword

  Recupera 26% extra CP en cada recarga.
• Sakura wah

  Restores HP by 3% and CP by 99 each turn.