Ikoku Irokoi Romantan

Ranmaru, a yakuza mobster's son, is the subject of the anime. On an Italian cruise ship, he weds the yakuza daughter of his childhood buddy, Kaoru (via an arranged marriage). They are the focus of attention on the boat since they are Japanese. Kaoru throws him out of their honeymoon suite after they argue on their wedding night. Ranmaru engages in combat with some yakuza in the bar on the boat. Alberto Valentino, an Italian man who speaks Japanese well, helps him out. In order to express his gratitude, Ranmaru asks Alberto to join him for a drink, which results in them having sex. Ranmaru learns that Alberto is the ship's captain the following morning.