Kusakabe make a brief first appearance along with the other members of the Japan Liberation Front. He asks if the JLF should attempt to rescue Suzaku Kururugi who was falsely accused for the murder of Clovis La Britannia. However, Zero appears and saves Kururugi shocking Kusakabe as well as the other members of the JLF.
Kusakabe later appears during the Japanese Liberation Front Hotel Incident as the one who planned the Hotel Jack Incident by himself without the authorization of General Katase or the other high ranking members of the JLF. Kusakabe along with a detachment of the Japan Liberation Front take all the Britannians in the hotel as hostages. He announces that he will free everyone as long as Britannia meets their terms. There are several people who are watching such as The Black Knights who question this action as well as Tohdoh who outright calls Kusakabe a fool. The Britannians try every possible way to save the hostages without giving in or revealing the fact that Euphemia Li Britannia is one of said hostages. After Zero appears and is allowed clearance to go through the Britannian Army, Kusakabe and Zero decided to have a conversation. However, after one of the JLF members report that they have Sub-Viceroy Euphemia, Kusakabe shouts to Zero that he has no use for him and lunges at him in an attempt to kill him. But, before he could, Zero uses his Geass on Kusakabe and the other JLF members and orders them to kill themselves. Afterwards, Zero was able to save all the hostages. Kusakabe's plan ultimately fails which resulted in the loss of support from the general populace and which contributed to the JLF's eventual downfall.