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 :

• Ninja Snowman

  3% chance to convert damage taken to HP positively.
• Iron Tortoise Shell

  Reduce damage taken by 200.
• Wood Top
• Sakura Lucky Bag

  Increase 3% damage, 4% chance to freeze attackers for 1 turn . Frozen target cannot move but damage taken is reduced by 80%
• Sakura Gold Jewellery

  Increases users agility by 1. Restores 3% of users max HP. Has 6% chance to convert damage taken to HP positively.
• Toxic Village Poison Potion
• Gruidae Wing

  Each turn recover 80 CP. Recover CP after HP reduction. (Amount: 8% of HP reduction)
• Fairy Wings

  Fairy wings that owned by a fairy
• S39 Spike Hammer

  Increase accuracy by 10% but reduce max. HP by 10%.
• Scroll: Posion Attack
• Chakra Magatama

  Increase 2% accuracy.
  Additional 5 HP damage upon all attack.
• Radish Launcher

  It will fly you to the moon! (Easter 2011 Limited Edition)
• Water Shark Skis
• Samurai Painted Wood

  5% chance to restrict enemy who attack user for 1 turn. (Restriction) target will not be able to use any skills.
• Universal Saber

  Increases users agility by 1. Recover 150 HP at the start of every turn.
• Fathers Treasure

  2014 Fathers Day special back item. Doubles the TP reward from TP missions.
• Colorful Snowflake

  Increase agility by 1. Has 15% chance to freeze enemy who attacks user (2 turns). Frozen target cannot move but damage taken is reduced by 80%.
• S12 Ancient Blood Evil Gourd

  Increase max. HP by 5%. But reduce Max.CP by 1%.
• S48 Titans Hammer

  The hammer used by titans to destroy castles in ancient times. Increases attack damage by 8% and accuracy by 5%.
• Turkey Tail
• Yawata Magatama

  Increase 3% accuracy.
  Additional 20 HP damage upon all attack.
• Kettle
• S15 Ancient Seitenken

  Recover CP after HP reduction. (Amount: 16% of HP reduction)
• Spiked Blade

  Increases dodge and critical chance by 4%. Recovers 70 HP each turn.
• Shigu Twin Blades
• S73 Smite Evil Shield

  Has 25% chance to absorb 2% HP of enemy who attack you. 8% chance to convert damage taken to HP positively.
• Call of the Angel

  Reduce damage taken by 100. Has 6% chance to convert damage taken to HP positively.