makes me wonder what happens later in their lives cuz one is moral n one is immoral

I want to believe after Minoru died Maru will take his soul and turn him into a demon himself so they can be together for a long time. Maybe an Au where both of them living together in modern world? Or another AU where when Minoru died not long after maybe a few decades? Maru like died too. But both of them got reincarnated and met each other and fall in love in the modern world