Upon arriving in the World of Agito, Yusuke is shocked that there are Grongi in the world which are being dealt with by Kamen Rider G3-X. He is further shocked when he sees an interview with Toko Yashiro, who is physically identical to the Ai Yashiro that died back in the World of Kuuga. Arriving at the police station, Yusuke offers to be the new user of the G3-X suit, but loses the position to Kaito. While this occurs, finding himself in a mailman outfit with a letter to Shouichi Ashikawa, Tsukasa and Natsumi find the man before they are attacked by what they think to be a Grongi. But during the fight, Tsukasa realizes he is fighting an Unknown, an Ant Lord called Formica Pedes.
Quest roles:
Kohsuke Toriumi(Ray-Rhino Yummy (voice)), So Yamanaka(Shoichi Ashikawa), Ami Michizoe(News (voice)), Natsuki Mori(Formica Regia (voice)), Katsumi Shiono(Kamen Rider Sabaki (voice)), Fumiya Tôei, Hiroko Sato(Tohko Yashiro), Isao Takeno(Detective of G3 Unit), Kohei Kurihara(Takahiro Furuya / Kamen Rider G3-X), Masaari Sakamoto(Guard), Hiroshi Doki(Master of Fumen), Shigefumi Ishihara(Guard), Masato Tsutamune(Ugly Duckling Society Member)