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 :

• Mech of Battle Gear

  Increase critical chance 3% and critical damage 8%.
• Carnival Taiko

  Play the Taiko in Ninja Saga Anniversary Carnival! Recover 5 HP and CP at the start of every turn.
• S13 Kishu Twin Blades

  Increase accuracy by 8%
• Thanksgiving Balloons

  Increase max. HP by 2%.
• Wood Top
• Skull Twins

  7% chance to convert damage taken to HP positively and 20% chance to absorb 1% HP of enemy who attack you.
• Zombie Hand

  Increase attack damage by 15%. But each turn reduce 200 HP and 300 CP.
• Sakura Rain Battle Umbrella
• Grave of the Undying

  Increase purify chance by 8%, but decrease agility by 15.
• Super Rabbit Doll

  Increase damage by 9%.
• Leos Recurve Bow

  Increases damage by 4% and dodge rate by 1%.
• S83 Four Wings

  Increase dodge rate by 8%.
• S3 Energetical Can

  Increase attack damage by 10% and Combustion chance by 18%. (Minimum requirement of 1 Attribute Point in Fire to activate combustion effect)
• Karasu Miya Falcon

  Increase dodge rate by 6%.
• S2 Ancient Bone Claw

  An ancient bone that emanates great power. Increases accuracy by 8%. Recovers 100 HP every turn.
• Chakra Message Stick
• Ninja Postman Bag

  Increase healing power of scrolls by 50%.
• Merlins Magical book

  Increases attack damage 5%
• Trident
• S69 Skull Cloak

  Increases Max. HP by 4%. Restores HP by 4%. Increase attack damage by 6%.
• Decorate Battle Umbrella
• Charming Aura (Red)

  2012 Valentines day limited aura, increase all damage 2%.
• Angel Wings

  Increase 3% attack damage and ignore 3% targets dodge.
• Lovely Santa Bag

  A bag that resembles Santa Claus, it emanates faint revitalizing aura. Restores 140 HP and 30 CP at the start of every turn.
• Heian-kyo Shamisen
• S16 Umbra Fire Wheel

  Additional 170 HP damage upon all attack.
• Scroll: Kochin