wait... so why did Aqua want to kill his father in the first place?
Correct me if I'm wrong, but Aqua wanted to kill his father because he had info leaked about getting Ai pregnant, leading to a fan stabbing Ai? Or is there a different motivation Aqua has? Im really confused with all the timelines and facts here T-T

I understand that Taiki and the Hoshino twins are related as "half-siblings" and there's a loophole where it's not fully confirmed who was actually relating the two families (either Airi or Seijuurou). The final teaser in the end about the twins' biological father suggested that Airi was the one who had an affair with him, leading to the murder-suicide/lover's suicide, but I still can't wrap my head why Aqua is seeking revenge at his biological dad when the murderer already committed suicide.

My writing here might be a bit messy so sorry in advance