2019：ハツコイ、ファイナリー！

宇宙から来た仮面ライダーギンガ！ 全てのものを滅ぼしてしまうその力に、スウォルツ達、タイムジャッカーも脅威 を感じる。 そして、アナザーキバ・北島祐子とも力を合わせ、ギンガに対抗しようという作 戦を立てるのだが……。 初恋の相手は祐子に違いない、という確信を持つソウゴ。 なんとか復讐はやめさせたいとアナザーキバに向かっていく。 祐子の冤罪事件が気になるゲイツは、事件のあった201５年へと飛び……。

Kamen Rider Ginga has now arrived from outer space! Swartz and the other Time Jackers also appear to be threatened by the presence of a force that can destroy everything! They try to join forces with Another Kiva, Yuko Kitajima, to find a way to defeat Ginga. Sougo has complete confidence that the person they're dealing with is his first love. He makes his way towards Another Kiva to try to find another way to stop her vengeful scheme. Meanwhile, Geiz who became extremely curious about Yuko's case, decided to travel to the year 2015 to uncover exactly what happened...