Watching people react to episodes of Death Parade, I found Yagami fucking Light in one episode. I dunno how I didn't catch this the first time I watched it but so many things make sense now. For the sceptics, Madhouse animated both series and confirmed that the reason why there was a 'surge of deaths' was cuz of Kira. Death Note occurs in Death Parade and vice versa.
Death Parade’s one of those anime I’ve heard of and vaguely thought, “I should watch that sometime.” Guess I gotta watch it now.
With how dark and violent their series, it makes sense that "Death Note", "High School of the Dead", and "Attack on Titan", excluding "AoT: Junior High", all share the same Japanese director.