Admiral Hiroyuki Kasui (糟井裕之, Kasui Hiroyuki; born 15 January 1963) is a retired Japanese naval officer who served as Commander of the Self Defense Fleet of the Japan Maritime Self-Defense Force (JMSDF) from 2019 to 2020. He was the 50th Commander of the Self-Defense Fleet, succeeding Kazuki Yamashita, and was himself succeeded in 2020 by Hideki Yuasa.
Source: “Hiroyuki Kasui”, English Wikipedia (CC BY-SA 4.0), excerpt
