Advertising t-shirt campaigns?

[Stefanie]

I am having a lot of trouble meeting my t-shirt fundraising goal. Unfortunately, time is limited on these shirts. The campaign ends in about 13 days. If we do not meet out minimum goal, the shirts do not get printed and we do not make any profit.

The shirt really is for a limited audience, mainly for otakus, anime & manga fans, and video game fans. I have tried to join every related group on facebook to post links to the shirt and share it constantly on tumblr and pinterest.

Does anyone have any ideas on where I can advertise this shirt?

The shirt can be found at www(dot)tfund(dot)com/rightinthekokoro
I wasn't sure if Yahoo would allow me to post links, hence why I typed the website the way that I did. Here is the link to the shirt: http://www.tfund.com/rightinthekokoro