Unexpectedly good, could be better. I'm still waiting for the adult version of yaoi where one of the mcs isn't quirky only for the sake of padding the story with friction between the horny one and the shy one. Please authors, put on your big boy/girl pants and make a mentally ill character. Don't tell me Haruki is precious and innocent. Admit he's fucking autistic. Like, come ooonnn. Of course he needs compassion and a very patient partner that loves both his capabilities and his shortcomings, but "master" needs half a ton of nuance if I am to take this story seriously. Perfect angels aren't interesting enough for me anymore.
Also, I would offer my left nut as sacrifice if my reward would be to NEVER read another "this relationship is too perfect so I better lie and run away" plotline.
Kyouju to Shitsuji no Shizuka na Seikatsu