Which came first, the manga or radio voice drama?

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Thanks, Hibana, for the manga source update. However, I wonder which was the very first source. According to Hitoshi Doi's seiyuu list there were, presumably before the anime, radio voice dramas. E.g. Asada Youko voices Casa Clover the 17th in both. If I recall correctly Saber Marionette started first as a radio drama (and the entry would seem to back this vague memory up). (As a side note voice dramas would seem to be neglected in Wikipedia, e.g. see the two entries cited, and I gather they've been rather important at times, sometimes as original sources, sometimes as a bridge from a manga to anime, e.g. [Oh My Goddess!], where the seiyuu for Ranma and Akane played K1 and Belldandy (!!!).) Hga (talk) 11:02, 10 August 2011 (UTC)Reply