The two became close in 2012 when they had their orientation session for an exchange program overseas.
Komuro now is attending graduate school while working at a Tokyo legal firm.
"We were far from each other for a long period of time, but we continued contacting each other, and deepened our relationship", Komuro said. In addition, he is studying business law at the Hitotsubashi University Graduate School of International Corporate Strategy in the evening.
When asked about their partner's strengths, Princess Mako, 25, likened Komuro, also 25, to the sun. This has a great difference for the males, as the law states that princes' who marry commoners will retain their royal title.
At the request of her parents Prince Akishino and Princess Kiko, who supported Princess Mako's relationship with Komuro, bodyguards from the Imperial Guard that must accompany the princess when she goes out tried to blend into the crowd while performing their duty.
Komuro maintained the heavenly love theme by saying Mako was a person who "watches over him calmly like the moon".
"I've been aware since my childhood that I would lose royal status once I married", Princess Mako said. They both graduated from ICU in 2014. She also received a Master's degree in Museum Studies from the University of Leicester in 2016.
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Komuro was dubbed as the "Prince of the Sea" in 2010 while serving as a tourism promoter for the city of Fujisawa.
Komuro is now working in a law firm while studying business law at Hitotsubashi University.
The announcement was originally expected in July, but was not made due to a rain disaster in the country.
On Sunday morning, Princess Mako introduced Komuro to the Emperor and Empress at the Imperial couple's residence at the Imperial Palace in Tokyo's Chiyoda Ward. This is called the traditional rite of betrothal called Nosai no Gi.
Japan's Princess Mako is set to lose her royal status when she marries next year.