Black Bullet Collaboration Event

Gastrea Sweeping Mission: Novice (ガストレア掃討任務：初級)

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Gastrea Sweeping Mission: Int (ガストレア掃討任務：中級)

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Gastrea Sweeping Mission: Expert (ガストレア掃討任務：上級)

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Gastrea Sweeping Mission: Master (ガストレア掃討任務：超級)

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Gastrea Sweeping Mission: Legend (ガストレア掃討任務：神級)

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 * First Completion Reward: [[File:20px-Coin2.png]]x1