Responses

There's no betrayal or so whatever, Yukii, even in the slightest, didn't consider Rimuru as a comrade. For a long time, Yukii's been searching for a specific skill, which unfortunately been given to Rimuru that will be reveal at a latter stage. For once, Yukii is the villain who manipulates everyone.
Beware of possible spoilers guys.
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Why did yukii betray rimuru what was his intentions in doing so? (〜 ̄△ ̄)〜