Irvine-based Kura Sushi USA Inc. (Nasdaq: KRUS) said its CEO has taken over interim chief operating officer duties.

Manabu Kamei last week resigned from the COO post at the restaurant operator, according to an SEC filing. Kura Sushi said Kamei’s same-day resignation “did not result from any disagreement” with the company or management.

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Chairman, CEO and President Hajime Uba is now handling COO duties until a permanent hire is made.

Chief Communications Officer Hiroyuki Okamoto fills the board seat left open by Kamei’s departure.

The revolving sushi concept, with 25 locations, is part of Japan-based Kura Sushi Inc., which has more than 450 restaurants. All 25 of Kura Sushi USA's doors are currently open for takeout with outdoor dining available at some restaurants, including Brea and Irvine.

Kura Sushi USA closed up 0.4% to $12.27 on Tuesday for a market cap of $102.4 million.