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 :

• Mimosa
• Three-stringed Lute Guitar
• Book of Slate

  Decreases Max. HP by 1% and Increase Max. CP by 10%. Increase 3% purify chance.
• Scroll: Kinjutsu I
• War Flag: World Peace
• Dark Blade

  Increase 2% critical rate and ignore 2% of targets dodge.
• S2 Scroll Capsule

  Increase attack damage by 8%. Recover 7% cp after dealing damage.
• Heart Aura

  Hidden feelings emerges! Recovers 2% of the user's max HP and 100 HP every turn.
• Harvest Treasure Bag

  Reduce damage taken by 140. Recover 5% extra CP when charge.
• S15 Ancient Seitenken

  Recover CP after HP reduction. (Amount: 16% of HP reduction)
• Sakura Rain Battle Umbrella
• Sakura wah

  Restores HP by 3% and CP by 99 each turn.
• Skull Twins

  7% chance to convert damage taken to HP positively and 20% chance to absorb 1% HP of enemy who attack you.
• Drum of Euphoria

  Recover 3% HP at the start of every turn, and recover 3% HP with every Charge.
• Tail of Jyubi

  Forged with chakra of the legendary tailed beast, Jyubi. Increase attack damage by 15% but reduce max. CP by 30%.
• Deadwood Pipa
• S35 Mini Teiko

  Increase agility by 1 and ignore enemys dodge rate by 2%.
• Scroll: Fire and Earth
• Swordfish
• S18 Evil Spirit Wings

  Increase 10% critical rate.
• S62 Black Steel Swords

  Restores 5% of users max HP.
• S42 Tendo Tips

  Increases attack damage and reduces damage received by 5%.
• Toxic Spider Web

  10% chance to apply Restriction on enemies who attacks the user for 1 turn.
  5% chance to freeze enemy who attack user (1 turn). Frozen target cannot move but damage taken is reduced by 80%
• White Metal Hammer
• Mech of Battle Gear

  Increase critical chance 3% and critical damage 8%.
• Black Double Gun

  Ignore enemys dodge rate by 3%. Increase accuracy by 3%.
• Shoguns Badge Gourd

  Increase Max. HP & CP by 3%