"I WILL FULFILL MY DUTY!"

Scene context

Rengoku declares his resolve at the start of the battle against Lower Moon One, Akaza, on the Mugen Train. With over two hundred sleeping passengers behind him, he locks onto Akaza and refuses to yield even an inch.

Character voice

First person 俺. Declarative, exclamatory. Trailing 「！！」 marks a forceful, unwavering tone — Rengoku's signature.

Grammar

～を全うする JLPT N1

An idiomatic structure meaning to carry out / to complete one's duty or role thoroughly. Conveys formal, declarative weight. Often appears in martial / professional / honorific contexts.

俺 JLPT N5

Masculine first-person pronoun. Rengoku consistently uses 俺, signaling a strong, masculine, casual-but-firm self-presentation.

Vocabulary

• 責務 [せきむ] JLPT N1 duty, responsibility (formal)
• 全うする [まっとうする] JLPT N1 to fulfill, to carry out completely

Sources

Verified against primary sources

• [manga_volume] Demon Slayer Vol. 8, page 54
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  俺は俺の責務を全うする！！

• [manga_shorts_bilingual] shared_assets/manga_bilingual/KimetsuNoYaiba/vol_008/054.json#dialogue[0]
  Show captured text

  俺は俺の責務を全うする！！

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