The KIA is very popular against the French Defense
After Black goes 1… e6 White will play this move
And black enters the French Defense by going 2...d5
This setup is also commonly used against the Sicilian
Where white also goes 2. d3 after 1… c5
The caro-kann players also face the KIA
White will go d3
And Black goes d5, reaching the Caro-Kann