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To be assigned to Tenrai-Sensei is both a curse and a blessing; it means your body will rest, but your spirit will be forged in the fires of the stars themselves.
The character " Tenrai-Sensei " appears to be an or a fan-created entity within the Demon Slayer: Kimetsu no Yaiba universe, as they are not part of the official canon roster. In fan-created content, titles like "Tenrai" (meaning "Divine Thunder" or "Heavenly Sound") often suggest a connection to Thunder Breathing or celestial-themed combat styles.
