The unnamed protagonist as well as Nana Kazuki are the newest God Eaters who have been found compatible with the 'P-66 Bias-Factor' and selected to join Blood, founded by Dr. Rachel Cladius and led by captain Julius Visconti. After his/her first missions, the protagonist meets Romeo Leoni, Julius's friend who is also a Blood member; Dr. Leah Cladius, Rachel's older sister; Director Gregory de Gremslow, the base's Supreme Commander; and Yuno Ashihara, a talented singer. The Blood group is later joined by two more P-66 God Eaters: Ciel Alençon, a master tactician from the same orphanage as Julius, and Gilbert "Gil" McLane, who is nicknamed "Fragging Gil" since his mentor Kate Lawry was K.I.A. five years ago. The Blood members lend aid to Fenrir's Far East Branch and work together with 'Cradle', a mobile emergency response and deployment station created after the incident at Aegis island. Each Blood member awakens their "Blood Power" through personal trials.
In comparison to Gods Eater Burst, there are new features and additions such as the four new weapons, the Boost Hammer, Charge Spear, the Variant Scythe and the Shotgun. The Boost Hammer is a hammer fitted with a rocket booster. The Charge Spear is a large spear that can be "charged" to form a sharpened organic blade. The Variant Scythe is a large scythe that can extend for a long range. The Shotgun is a large cannon that sprays bullets, allowing increased damage the closer the player is to the opponent. Most of the existing weapons have additional features and skills, such as the Short Blade's "Rising Edge" upward slash that sends the character into mid-air and can continue to an aerial combo, and the Long Blade's "Zero Stance" skill that can cancel attack animations, thus allowing longer combos or cancel an attack to block or dodge attacks.
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