|This article is about a/an spin-off media story in Kamen Rider Agito.|
Heaven's Door is the first Kamen Rider Agito Edition of S.I.C. Hero Saga, based on Kamen Rider Agito. Published in Monthly Hobby Japan magazine. It features a crossover with Kamen Rider 555. It introduces the new characters Mirage Agito (ミラージュアギト Mirāju Agito) and the Dog Orphnoch/Dog Lord (ドッグオルフェノク／ドッグロード Doggu Orufenoku/Doggu Rōdo). The story was published from October 2003 to March 2004.
- Heaven's Door chapter titles
- Outset (発端 Hottan)
- ΑgitΩ (アギト Agito)
- Operation (操作 Sōsa)
- Conceit (奇想 Kisō)
- Able Person (能力者 Nōryokusha)
- The Alpha and the Omega (ΑにしてΩ Arufa ni shite Omega)
There's a lot of killings happening with the recent one being a nude woman found impaled on the top of Tokyo Tower. An Agito is sighted at the scene. While Hikawa is investigating, the Agito and a dog-type Unknown attack him. Though Exceed Gills and Another Agito appear to his aid, they are easily defeated. Luckily, Agito/Shouichi Tsugami finally shows up. The real identity of this Agito is Shouichi Maguichi, who was crazed after being blamed for cheating on the programs for using a hidden camera during his childhood. Wanting to cure his sick mind he worshipped the Dog Orphnoch/Dog Lord and was told to feed on the despair of the public. After Agito and the others kill the Dog Lord/Orphnoch, Maguchi/Agito transforms into Mirage Agito out of rage. In a fight with Kamen Riders Agito and Gills, despite gaining the upper hand he is defeated by the strategized use of the Shining Caliber and a Shining Rider Kick. Maguichi is then arrested and is given an unspecified treatment, his fate is currently unknown.