The Heroic Legend of Alain (2016 - 2017)

Continuity with Kamen Rider Ghost: Chapter 2 occurs over the course from episodes 16 to 26.

Continuity with Kamen Rider Ghost: Chapter 3 occurs sometime during and after Episode 29.

Continuity with Kamen Rider Ghost: This chapter takes place sometime after series finale. The final scene takes place many years into the future, presumably sometime after "Kamen Rider Ghost RE:BIRTH: Kamen Rider Specter".