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 :

• Black Metal Hammer
• Toxic Mushroom

  Increases damage by 10% but the user takes 200 HP damage every turn.
• Butterfly Wings
• Genin backpack (Blue)

  Double mission XP reward in level 11 to level 20.
• Cornucopia

  Increase healing power of scrolls by 100%. Has 6% chance to convert damage taken to HP positively.
• Carnival Fan

  Dance with the Fan during Ninja Saga Anniversary Carnival! Increase all attack damage by 3%.
• Christmas Treasure Bag

  Increase agility by 1.
• S21 Rokulin Gunbai

  Ignore enemys dodge rate by 8%.
• Sanmoku Gourd

  Reduce damage taken by 65.
• Knot of Avenger

  20% chance to absorb 2% HP of enemy who attack you. 20% chance to restrict enemy who attack user for 1 turn. (Restriction) target will not be able to use any skills.
• Flame Blade Raijinco
• Tail Hunter Back Item

  Increase max. HP by 3%.
• Hanami Dango

  Reduces damage received by 7%. Restore 85 HP every turn.
• War Flag: Furinkazan
• 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.
• S64 Twin Pinnacle Spear

  Powerful spears that can pinpoint enemy's weaknesses. Increases accuracy by 12%. But reduce self dodge rate by 5%.
• Raccoon Tail
• Sengoku Flag

  Increases damage by 4%. Each turn recover 120 HP.
• Big Cheese

  Recover CP after HP reduction. (Amount: 10% of HP reduction)
• Dark World Hammer
• Chakra Kanawa

  Recover CP after HP reduction. (Amount: 20% of HP reduction)
• Paper Envoy of God

  Increases attack damage and reduces damage received by 4%
• S42 Hanbing Hammer

  8% chance to convert damage taken to HP positively.
• Smart Phone
• Musashi Twin Blades
• Ninja Bunny Doll

  Increase 2% damage and ignore 3% targets dodge.
• Dark Blade

  Increase 2% critical rate and ignore 2% of targets dodge.