Yandere Mitsuru Hitokoe x Male reader

M/n is Hajime's little brother. He is also dating Mitsuru Hitokoe,Mitsuru had a obsession with M/n as long as he could remember. What m/n doesn't know is that Mitsuru had killed for him in the past,he works with him but some of the prisoners and officers take a likening to M/n and Mitsuru's yandere side show's again.