Riku Rinkama died on February 15, 1988.
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He ends up with Riku because Risa never loved Niwa kun
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.
In the manga, Dark starts off liking/loving Riku, but as the story continues, he starts to fall for Risa. When Daisuke suddenly transforms into Dark at school after having an encounter with Riku, Dark runs into Risa. After she tells him how much she wanted to see him, she suddenly kisses him. He then transforms back into Daisuke. Daisuke then notes that Dark had a strong reaction to Risa. Later, when Dark takes Risa on a date, he questions how she would react if she found out he was a monster. The answer she gives him really means alot to him. Later, Daisuke's father notes that because of the Niwa's history, Dark had no choice but to "be loved", but he's now starting to change and understand what it means to be "in love", and the reason for this change is Risa.
It's still ongoing, about chapter 73 when Riku questions wether or not Niwa is DaRK
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.