Thanks again for your answer.
This song is a threnody of the caused by the capsizing of a boat by Kaisei students in 1810. Kaisei School is the oldest private school for boys in Kanagawa prefecture. Before the war, the children of Navy officers learned there. And the principals at that time were retired generals or lieutenant generals.
And most of the students who graduated there entered the Navel Academy. The original song may be a hymn.
The song and its English translation.https://www.youtube.com/watch?v=4SGcpFReLN4
The white-capped summit of Mt. Fuji and the green-shrouded Enoshima Island
Looking up at them until the tears stand in our eyes
To the twelve brave spirits who would never return
We offer our deepest feelings, soul and heart
Their boats sunk fathoms to the bottomless depths of the sea
They were helpless before the stormy winds and the waves
They turned to their mothers and fathers for help but none was proffered
Holding back tears of regret we mourn at Shichiriga-hama
Hear the sobbing snow and the whistling wind
Tonight the moon and the stars have all disappeared
To what place have those lost souls gone to roam, we wonder?
As we pray for them a sound sleep at their mother’s warm breast
Yesterday’s moon has disappeared behind the clouds
Alone in this place, no one else to be seen for miles
In my sleepless nights I dive fathoms to find their souls
And awaken to hear the sound of the weltering waves
Whistling plovers wing alone across the sea
All those spirits we knew who are not to return forever
Holding back tears of deepest regret we remember
Today, tomorrow and then forever