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 :

• Ronin Straw Hat

  Additional 100 HP damage upon all attack.
• Engagement Ring

  Additional 20 HP damage upon all attack.
• S2 Scroll Capsule

  Increase attack damage by 8%. Recover 7% cp after dealing damage.
• Great Wooden Hammer (7 Days)

  Increase healing power of scrolls by 50%.
  Reduce 8 HP damage taken.
• Mech of Battle Gear

  Increase critical chance 3% and critical damage 8%.
• Tail of Capricorn

  Increases dodge rate by 4%. Recovers 3% HP with every charge.
• S38 Genrei Fan

  Increase max.CP by 50% but reduce max. HP by 20%.
• S13 Ancient Kishu Twin Blades

  Increase accuracy by 6%
• Blue Bird Wings
• Hanagara Dama

  Increase max. CP by 6%
• Sealed Wood

  A back item which lost the original effectiveness.
• S8 Sign of Corruption

  Wings with an ominous aura. Increases agility by 3.
• Great Wooden Hammer (3 Days)

  Increase healing power of scrolls by 50%.
  Reduce 8 HP damage taken.
• Giant Copper Coins

  Increase Mission gold reward by 30%.(Mission Only)
• Iron Tortoise Shell

  Reduce damage taken by 200.
• Writing Brush
• Evil Way Lute

  Has a 50% chance to recover 5% of maximum HP. Has 10% chance to absorb 3% HP
• Gruidae Wing

  Each turn recover 80 CP. Recover CP after HP reduction. (Amount: 8% of HP reduction)
• S8 Scroll of Golden Snake

  Increase all attack damage by 4%. Decrease damage taken by 4%.
• Scroll: Sun of Campaign
• Puppet: Hakuki

  Increase 3% accuracy.
  Reduce 46 HP damage taken.
  Recover 83 HP when each turn start.
• S35 Mini Teiko

  Increase agility by 1 and ignore enemys dodge rate by 2%.
• Snowflake

  3% chance to freeze enemy who attack user (1 turn). (Frozen target cannot move but damage taken is reduced by 80%.)
• Sealing the soul barrel
• Assault Kite

  Recover 100 HP and 80 CP at the start of every turn.
• Scroll: Rikugo
• Patriot Aegis

  A mythical shield that can block even the most vicious attacks. Increases max HP by 3%. Has a 60% chance to recover 5% of maximum HP and reduces damage taken by 75.