Wet Lust: Opening the Tulip (1975)

Akira and Hiroshi are two lowlives who work at a pachinko parlour. Hiroshi is a ladies' man but always loses at pachinko. Akira is a virgin at 25 but always wins. Hiroshi tries to get Akira laid with little success but things change when Akira is informed of a 88 million yen inheritance. But only if he can get married.