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 :

• S33 Book of Fate

  Increase Max. HP & CP by 4%
• Rose Cloak

  Restores 80 CP at the start of every turn. Converts 8% of damage taken into CP.
• Scroll: Rikugo
• Mother's Hug

  Recover 100 HP and 2% HP at the start of every turn.
• Decorative Rope
• Curved Spear
• Sakura Dance

  Increase damage by 3% and max. HP by 4%.
• Mech of Wing

  Reduce damage taken by 10%.
• Scroll and Blade

  Has 11% chance to restrict enemy who attack user for 1 turn. Restriction target will not be able to use any skills. Increase critical rate by 5%. 8% chances of using Jutsu without CP.
• Charming Aura (Red)

  2012 Valentines day limited aura, increase all damage 2%.
• Blue Shell
• Holiday Doll

  Expecting Santa in every year! Critical and dodge rate increase 3%.
• S63 Stormbringer

  Increases dodge rate by 5%. Has 50% chance to absorb 2% HP of enemy who attack you.
• S2 Scroll Capsule

  Increase attack damage by 8%. Recover 7% cp after dealing damage.
• Ice Cystal Raijinco
• Scroll: Kinjutsu I
• S57 Magatama Gunbai

  Increases dodge rate by 5% and restores 4% of users max HP every turn.
• Shadow Twin Blades
• S34 Wooden Name Tag

  Recover CP after HP reduction. (Amount: 20% of HP reduction)
• S14 Profound Tentacles

  35% chance to restrict enemy who attack user for 1 turn. (Restriction) target will not be able to use any skills.
• Mimosa
• Charming Aura (Black)

  2012 Valentines day limited aura, increase critical chance 2%.
• Native Horn

  Increase max. CP by 3%, Recover 1% HP with every Charge.
• S8 Underworld Bulwark

  A phantom shield with demon soul. Reduce damage taken by 10%.
• Gummy Bear

  Restores CP by 2%. Reduce damage taken by 100.
• Kettle
• Shadow Umbrella