感情が次第に抑えられなくなり腕の筋が浮き上がる夕雲(仮名)を見て提督は言い放つ
「カンムス...マイ......フレンド...」
それがビンタ直前に彼が残した言葉だった...

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Source: https://twitter.com/rinc7600/status/1442421317236445189
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As she lost control of her arm muscles when her emotions boiled over, Yuugumo (pseudonym), the Admiral was seen to have cried,
"KANMUSU... MY...... FRIEND..." (Phoenetic English, barring 'Kanmusu')
as his last words just before the slap...

Source: https://twitter.com/rinc7600/status/1442421317236445189