It happens as Yuri is merging with the others. In his last moments as an individual, he quickly lives through the memories of the other Yus. After seeing that their good nature is what got each of them at least one friend, which was enough for them to deem their life happy, Yuri finally understands what he missed in his own. Just as he breaks down, Hakaishin takes over. At the Yus cease to be.
But even after being split again; while Yuya, Yugo, and Yuto are just traumatized and weakly but enthusiastically embrace their girls, Yuri just laying there emotionless. His hatred for humanity was everything he remembers driving him, so now that he understood what exactly he had done, he can't imagine what to do now. Selena looks at the three pair crying together and hugging, and shakily stoods up and walks over Yuri. Carefully, she stretches an hand toward him. Yuri looks at her with empty eyes, wondering if she was there to put an end to his suffering or just hit him while he's down. «Get up.» she orders. «I'm not gonna let the two us being the only one moping when the others are celebrating.» «Kill me.» he whispers. «Pfui. I don't back down from challenges. And my next one is making sure you find something to live for again.» A single gleam of light sparkles again in his eyes for a moment...
...and a tiny tear drops into the pitch-black void, illuminating it a little...