Dairanger: In the episode where Rin becomes an idol. The gouma has been sucking the energy out of her by putting her in the public eye. And yet, she falls for him. And eventually, he reciprocates, only to be killed.
The really sad part is at the end, when Rin sets the picture into the water and softly sings her single. All the guys in the team want to comfort her, but they know she has to be alone for this.
Ultraman Nexus: It's a tossup here, but I'm going to go with the moment Himeya realizes that he's not being punished by being Ultraman. The other moment is after Faust saves Komon from Nosfer, and Riko dies a second time, in Komon's arms.
Kamen Rider Blade: The ending scene where Hajime sees Kenzaki, looks away and then he's gone.