Danshaku no Aijin

Some time ago, the son of a long line of earls, Reiichirou Houjou, was forcibly pushed down by his arrogant classmate, Kanae Himuro. Six years later, the two meet again, and Himuro uses his power to make Houjou accompany him on a cruise as an employee, in place of his little sister. Houjou thought he was prepared, but when Himuro declared, "Remove your clothes, and I'll make you feel good," he was instantly brought back to that one time pleasure he thought he had long forgotten. On a luxury cruise bound for London, the Taisho era romance of the man with great integrity and the man who just thinks he’s great unfolds.

(Source: Libre, translated)