To be included with "S.I.C. Hero Saga Kamen Rider Den-O Special", a special publication from Hobby Japan. Vol. 1 of this magazine was released 5 years back. Another magazine with related content but with different title called "S.I.C. Tamashii Taizen" was out in 2008. "Kamen Rider Den-O Special" would be Hobby Japan's effort to revive this magazine sub series maybe.
Mid May release, 7,800 Yen (inclusive of tax).
All images are from ToyWorld Forum.