Tomoya Suzuki, 22, was planning to propose to his girlfriend aboard the Kazu I, the sightseeing boat that disappeared off Hokkaido. The two remain missing, but relatives of the couple have signed and submitted a marriage certificate on their behalf as a symbolic way to help them realize their wishes.

"We wanted to at least fulfill the wishes of two people who have vowed to love each other forever," said Suzuki’s uncle, Kensuke, 38.

Tomoya once visited Kensuke’s home in the city of Kushiro with his girlfriend — affectionately known by her nickname “Yucchi.” He had prepared to propose to her aboard the boat on Saturday — Yucchi’s birthday