|This article is about a/an novel in Kamen Rider Gaim.|
- For the stageshow, see Kamen Rider Gaim Gaiden: Kamen Rider Zangetsu
Kamen Rider Gaim Gaiden: ~Kamen Rider Zangetsu~ (小説 仮面ライダー鎧武外伝 ～仮面ライダー斬月～ Shōsetsu Kamen Raidā Gaimu Gaiden ~Kamen Raidā Zangetsu~) is a novel set within the continuity of Kamen Rider Gaim. It tells a side-story not shown within the Kamen Rider Zangetsu: -Gaim Gaiden- stage show.
- This is the second Gaim-based book that launched in Kodansha's Kamen Rider novel line.