uke sister dies. he investigates a club where the perps who raped and drove her to suicide were from. turns out seme led him there, orchestrating the club members deaths coz he is a psychopath who felt like he had a good excuse to kill bad people. uke becomes his via seme's manipulations, but also falls for him and ultimately protects him and stays on his side despite his mental illness. seme continues to have desires to kill, but holds back for uke temporarily but cannot forever. kind of bittersweet open end.
The Beast Must Die