Eiken (エイケン) is a Japanese manga series written and illustrated by Seiji Matsuyama. The story depicts the life of schoolboy Densuke Mifune after he is forced into the mysterious Eiken Club. The manga series ran for eighteen volumes, and additionally included a series guidebook. A number of radio drama episodes and a two episode OVA (the latter roughly based on a volume 3 storyline) have also been produced. The first twelve manga volumes have been released in North America. The first three volumes were rated 16+, while subsequent volumes were rated 18+.
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