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 :

• Big Cask

  Increase max.HP by 15% but reduce max. CP by 5%.
• MegaJingleBell

  A glorious Christmas artifact which can be used in battle. Ignores 5% of enemys dodge rate. Recovers 2% of users max HP every turn.
• Drum of Euphoria

  Recover 3% HP at the start of every turn, and recover 3% HP with every Charge.
• S71 Magic Clock

  Increases Max. CP by 10%. Recover CP after HP reduction. (Amount: 20% of HP reduction)
• Scroll: Sun of Campaign
• Leos Recurve Bow

  Increases damage by 4% and dodge rate by 1%.
• S31 Yabusa Dual Head Spear

  Increase 4% damage and 4% critical rate.
• Fire Symbol Guitar
• S51 Enchanted Winged Carapace

  Increases accuracy by 3%. Recover 4% HP at the start of every turn.
• Cupids Flying Envelop

  A message to a far away lover.
  Reduces damage taken by 60.
  Increases max HP by 5%.
• Vampire Cloak

  Increase healing power of scrolls by 100.
• S23 Meschiken

  Recover CP after HP reduction. (Amount: 20% of HP reduction)
• Sakura Dance

  Increase damage by 3% and max. HP by 4%.
• Gunbai: World Peace
• Gunbai: Gyoji
• S10 Frostguard's Bow

  A magical bow that has a very long range. Reduce target 8% CP on every weapon attack.
• Emblem backpack (Yellow)

  Double mission XP reward in level 1 to level 20.
• Angel Wings

  Increase 3% attack damage and ignore 3% targets dodge.
• Hanami Fan

  Ignore 4% targets dodge and increase max. HP by 2%.
• Folk Folding Fan
• Mother's Hug (II)

  Recover 150 HP and 3% HP at the start of every turn.
• Ritual Taiko
• S15 Seitenken

  Recover CP after HP reduction. (Amount: 20% of HP reduction)
• Force of Taotie

  Reduce damage taken by 7%.
• Flour Stick
• Iron Tortoise Shell

  Reduce damage taken by 200.
• Scroll: Messenger

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