A gasoline tanker truck at an Idemitsu Kosan gas station in Tokyo. The supertanker is listed as being operated by the tanker arm of the Japanese energy conglomerate. | BLOOMBERG

A laden supertanker linked to Japan appears to have completed a transit through the Strait of Hormuz, in what may be the first successful attempt by an oil carrier from the country to leave the Persian Gulf since the Iran war began.

The Idemitsu Maru began sailing late Monday toward the strait from northwest of Abu Dhabi, where it had been sitting idle for more than a week, according to compiled tanker-tracking data.…