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There are two routes, but one of them branches off into two distinct paths. For the first—and main—route, you must accept the encounter with Nadya (regardless of whether or not you have had a "romance" with Hanna). Declining the encounter with Nadya can also lead you to the main route, provided that you *did* have a "romance" with Hanna. To access the other route, you must first force Hanna to... well, you know... and then turn down Nadya. By doing so, you will enter the second route—known as "Futa on Futa"—and, depending on the decisions you make within it, you will unlock specific endings.