Kodansha Comics is teaming up with Humble Bundle for the “Humble Manga Bundle: Attack on Titan Universe” bundle.

The offering amounts to over $500 worth of digital manga, or 44 complete volumes of Hajime Isayama’s monster hit manga Attack on Titan. The actual cost of the bundle is based on Humble Bundle’s unique pay-what-you-want charitable model.

The manga comes in multiple formats including CBZ, PDF, and ePub, so they can be read on computer, e-readers, iPads, cell phones, and a wide array of mobile devices. Bundle buyers choose where their money goes—among Kodansha Comics, two charities, and, if they like, a third charity of their choice via the PayPal Giving Fund. If they like what Humble Bundle does, they can leave a Humble Tip too.

The bundle benefits the ACLU and World Land Trust.

This special bundle ends WEDNESDAY, January 31, 10:59 A.M. PACIFIC TIME.

Here’s what bundle buyers get with each tier:

Pay $1 or more 
Attack on Titan volumes 1-5

Pay $8 or more 
All of the above + Attack on Titan volumes 6-15 and the spinoff series:
Attack on Titan: Lost Girls volumes 1-2
Attack on Titan: No Regrets volumes 1-2

Pay $15 or more 
All of the above + Attack on Titan volumes 16-20 and the spinoff series:
Attack on Titan: Before the Fall volumes 1-11
Attack on Titan: Junior High volumes 1-4

Pay $18 or more 
All of the above + Attack on Titan volumes 21-22 and the spinoff series:
Spoof on Titan volumes 1-2
Attack on Titan Guidebook: Inside & Outside
+
The Humble Bundle exclusive never-before-released 
Attack on Titan Exclusive Artbook 
including rarely seen illustrations by Hajime Isayama and a global lineup of comics greats inspired by Attack on Titan