Kamen Rider Series: Season 31, Episode 5

31 - 5: 我が友、雷の剣士につき。

Touma and his friends must face Kamen Rider Calibur, a former member of the Sword of Logos who defected to the Megid's side. Meanwhile, Touma realizes that Kento is disturbed by the enemy's appearance and learns the connection between them.