Michinaga transforms into Buffa and goes straight for Niram's headquarters, but Ace appears as a ronin to stop him as Geats Boost MarkII. He is able to overwhelm Buffa and protect the Vision Driver. Meanwhile, Ziin approaches Niram to get answers regarding the secret Ace's usage of Boost Mark II. Just what secrets is Ace hiding?
[Episode summary from Kamen Rider Wiki]