Raiden-18 (stylized in all caps) is a Japanese manga by Hiromu Arakawa.

It was irregularly published in Shogakukan's seinen manga magazine Monthly Sunday Gene-X from 2005 to 2021, with its chapters collected in a single tankōbon volume.

Written and illustrated by Hiromu Arakawa, Raiden-18 was irregularly published in Shogakukan's seinen manga magazine Monthly Sunday Gene-X; the first two chapters were published on July 19 and December 19, 2005;[3][4] the third one on December 18, 2010;[5] and the fourth on January 19, 2021.

[2][6] Shogakukan collected the chapters, alongside an epilogue chapter, in a single tankōbon volume released on June 9, 2021.

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