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[Vampire + Sand Sculpture + Daily] The Light Era was originally the last drop of "unjust blood" in this world, but for unknown reasons, it came back to this world after reincarnation. Before the college entrance examination, due to some accidents, he awakened his original strength and his most primitive bloodthirsty nature. (But before he was a drop of blood, he was someone in a certain world, but these memories have been sealed...) [The introduction is too weak, please read the text!