絶望!!寝取られ戦隊 -俺たちの絆はなんだったんだ-

The Earth is in crisis, under attack by aliens with advanced scientific capabilities.

The monsters torment humanity with despicable means.

A man from the alien side brings technology to Earth.
With his presence, humanity has a means to fight back!

Rise up, five heroes of justice!
Don your suits of justice!
Their name is Keyranger K!!

Save the Earth with giant robots!
Now the Earth has hope!

But that was also the beginning of despair...

Keyranger K's leader, Seigi (Red), is attracted to his fellow team members, Reika (Yellow) and Hanako (Pink). And Reika and Hanako also harbor feelings for Seigi... Their delicate relationship should have blossomed someday... but the invisible bond crumbles away unseen.

Before Seigi's final choice, it was already over. His comrades and the enemy monsters take Reika and Hanako away. When Seigi learns the truth... what kind of despairing future will this create for humanity?