It seems the crazed maniacs who obsess over Kannagi heroine Nagi-sama’s virginity truly are on the fringes, or at least are counterbalanced by an equally obsessive contingent of the opposite persuasion, for we hear that in recent auctions membership cards for the official Kannagi Fan Club have reached prices of ¥20-25,000 ($250), with nobody quite able to explain why.
If you really are desperate, you could always make your own (they do not incorporate biometric authentication or otherwise):
Zange-chan too features:
One possible factor is an upcoming fan club event, which offers a free poster of Nagi-sama herself, but even to maniacs we would not think this rather plain poster would hold appeal equivalent to two or three figures.
The illustration on the card is also not especially noteworthy; just what could the cause of this sudden Nagi boom be?