Zero.

Summary

In a cosmic setting, Zero encounters Tōzawa Yari, the Extreme Demon Sorcerer, who claims he has come to save both Zero and the Zero Civilization. Initially skeptical, Zero learns that Tōzawa can communicate in the universal language of his civilization, prompting him to follow Tōzawa into a courtyard where powerful beings gather. Among them are Ai Wei Er, the Lord God of Guangming, and Ni Mei Ka, the Nineteenth Hell's Heavenly Demon God. They reveal that the answers Zero seeks are behind a red door, which he must open to prove his identity. As he approaches the door, a familiar symbol appears, leading him to connect it to a revered totem of his civilization.

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