Japanese Princess set to marry prince of the sea.

• Japan's imperial law covers marriage of royalty to a commoner
• Princess Mako's aunt also gave up her title after marriage

Japan's Princess Mako is giving up her royal status -- all in the name of love.

The groom-to-be is a prince himself ... of sorts.

The Imperial Household tells CNN plans are underway for the 25-year-old princess, granddaughter of Emperor Akihito, to become engaged to Kei Komuro, also 25, a law firm worker and graduate student who once starred in a tourism campaign as "Prince of the Sea."

The couple met five years ago as students at the International Christian University in Tokyo, Japan's national broadcaster NHK reported.

It was while in university that Komuro played the "Prince of the Sea" in a beach tourism campaign for the city of Fujisawa, south of Tokyo.

Kei Komuro, center, is interviewed by reporters in Tokyo Wednesday, May 17 2017.

Shrinking imperial family

Japan's centuries-old imperial law requires a princess to leave the imperial family upon marriage to a commoner.

The last to do so was Princess Mako's aunt, Sayako, the only daughter of Emperor Akhito, when she married town planner Yoshiki Kuroda in 2005.

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