So Sekai just sent out a correction email stating you can enter their contest by pledging $30 to the Kickstarter OR "You may also enter for free by mail to the address in the footer."
You can send them a ... letter in the mail to enter. As I'm not up on the legal aspects of giveaways, I'm not sure but this seems more legit because there is a way to enter for free. But, what the heck, sending LETTERS in 2016 to enter a contest?
Anyway, here's the info for anyone interested:
"NO PURCHASE NECESSARY to enter in our giveaways please mail your entry to the address below.
Our mailing address is:
Sekai Project
9415 Culver Blvd #166
Culver City, CA 90232"