What's Go Shijima's Reason to Fight? (詩島剛が戦う理由はなにか Shijima Gō ga Tatakau Riyū wa nani ka) is the twenty-seventh episode of Kamen Rider Drive. It features the in-series debut of the Ride Booster Set and the Booster Tridoron combination following their initial appearance in the Rider Grand Prix of Super Hero Taisen GP: Kamen Rider 3Image:Icon-crosswiki.png.