Alubino Games - MonMas II: Monster (Girl) Masters II Final (eng) - Adult Sex Game

Machine Translation

You're the champion of monko (monster girl) hunters!
But look out, your natural knack for winning at battles makes you
a target for jealous spectators and managers.
However, you've got bigger problems: your little sister's illness
is racking up huge debts, and she's taken a turn for the worse.

Now you must join forces with your rival Razor,
and hunt down the elusive Magic Tail in a quest that
transcends mere girl battles. Save your imouto!