the sad story

You may think Nidoking, Nidoqueen and Nidorina live cheerful lives.
No, they don't.
The only one that really lives a cheerful life is Nidoran.
You see, it was originally a family of 7. Their dad hung himself because they hated how Nidorina was adopted. Their mother was shot dead after she smuggled cocaine into the Nowhere Region. Yes, they live in the Nowhere Region.
And yes, Nidorina was adopted.
Tragically, Nidorino and Lily didn't come back alive from their adventure. They were hunting for a shiny Wartortle in Wartortle Islands.
And Wartortle Islands doesn't allow anyone other than Wartortle. Yeah, Nidoqueen and Nidoking are allowed. Nidorina would get a warning. But Wartortle hates Squirtle and Blastoise, so Wartortle shoots them.
Nidoqueen and Nidoking were crying very hard. Nidorina shed a few tears, but...
Nidorina didn't really care because he was adopted.
But then, came the day, when a random stranger killed Shian. Nidorina lives his life in black and white, while Nidoking and Nidoqueen live their lives in a bunch of tears.
The only way to make Nidorina happy again is revive her friends.
The only way to make Nidoking / Nidoqueen happy again is... well they're orphans. Adult orphans...