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 :

• Ferret Tail
• S10 Frostguard's Shield

  Shield of the valiant warrior Tundra. Increase agility by 2. Has 17% Chance to stun target when attack with weapon for 1 turn.
• S9 Warring Empire Guarding Bow

  An ancient enchanted bow with great range used in warfare. Increases accuracy by 10%. Restore 100 HP every turn.
• Force of Taowu

  Increases Max. HP by 4% and Max. CP by 4%.
• Wings of Eternal Eclipse

  Increases critical chance by 3%. Ignores 6% of the targets dodge rate.
• S18 Kamimachi Lantern

  Increase 4% critical rate and recover HP by 1%.
• S14 Profound Pincers

  20% chance to freeze enemy who attack user (1 turn). Frozen target cannot move but damage taken is reduced by 80%.
• Scroll: Kochin
• Hide Guitar
• Toxic Village Poison Potion
• Great Wooden Hammer (3 Days)

  Increase healing power of scrolls by 50%.
  Reduce 8 HP damage taken.
• Black Metal Hammer
• Sealing Pot

  Increases Max. HP by 4% and recover 3% HP at the start of every turn.
• Triple Taiko

  Increases Max. HP by 4% and healing power of scrolls by 100%.
• S12 Blood Evil Gourd

  Increase max. HP by 5%.
• Falcon
• Fathers Treasure

  2014 Fathers Day special back item. Doubles the TP reward from TP missions.
• S62 Black Steel Swords

  Restores 5% of users max HP.
• S61 God Dragon Flag

  Increase critical rate by 6%. Has 20% chance to apply Restriction on enemies who attacks the user for 1 turn.
• S70 Magical Cobweb

  Restores CP by 3%. 30% chance to restrict enemy who attack user for 1 turn. Restriction target will not be able to use any skills.
• S12 Golden Bujin Ax

  Increase attack damage by 20% but increase damage taken by 12%.
• Training Dummy

  Increases accuracy by 5% and dodge rate by 4%.
• Dual Blade of Fire

  Increase 3% damage made, recover self 2% HP each turn.
• Emblem backpack (Yellow)

  Double mission XP reward in level 1 to level 20.
• Assault Kite

  Recover 100 HP and 80 CP at the start of every turn.
• Black Silver Electric Guitar
• Sealed Wood

  A back item which lost the original effectiveness.