See if You Like Shochu
Of the varieties of alcohol in Japan, Shochu is the most common hard liquor that is often drank on its own and is mixed in a variety of drinks. It's strength is typically in the 15-20% range and comes has a wide variety of brands to try. It tastes like sour plums. Even if you don't like it on its own, you might in enjoy it in the form of a highball cocktail or in its chuu hai can varieties that are widely available at convenient stores.