Better start learning to read and write Japanese then so you can participate in the ingame chat. Be prepared for lots of text scrolling by and constant tabbing out to a dictionary to understand what the hell people are saying (or even looking up kanji by radicals, since text from ingame chat can typically not be copy-pasted). Be prepared to struggle with the ingame IME. Be aware that, apart from standard Japanese, there will be internet slang and game specific jargon. And of course know that, on the off-chance that you actually do find a female player, you will no doubt face competition from other (native) players for her attention.
Or you could try to find a Canadian gamer girl. Of course, even then the usual online gaming caveats apply: female players might say they're male in order to avoid unwanted attention, and male players might say they're female in order to get free stuff.
Keep in mind that manga, anime, visual novels... are typically exagerrated, idealized, unrealistic fantasies. See also
Japanese Girls Are The Best