We all know that Diva wishes to have a family that will let her feel she is loved... but she killed Riku (the father of her twin babies) instead.
And the reason for that is, she wants to kill Saya's loved ones so that nobody can ever love Saya and for her to feel the loneliness, sadness and pain she felt in a long of time alone inside the tower or in other words Diva wants revenge.
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IN episode 39 Diva first knocked out Kai then stripped her clothes and then raped Riku afterwards she killed him. Later she was revealed pregnant.
You mean Riku? Well, he gets killed by Diva Saya resurrects him by turning him into her chevalier Then Diva rapes him and she accidently kills him, killing him permanently
He dies in episode 32. Diva rapes him and gives him her blood so he crystallises and dies.
Riku Rinkama died on February 15, 1988.
He ends up with Riku because Risa never loved Niwa kun