During a crucial tournament match, a woman identified as Lena faces mockery for using an F-grade puppet core. To turn the tide, she secretly uses the last piece of her family's high-energy dragon blood ore, causing her puppet to jump straight to silver grade and defeat a superior opponent. The crowd is stunned, but an opponent's handler accuses her of cheating and possession of the stolen, banned ore. Just as Lena is threatened with expulsion, the academy-wide dragonblood energy alarm triggers, revealing her secret use of the ore to the authorities.