well from what im getting they grew up in a very stressful household, which caused the little brother to become warped. most likely the little brother is aware of his situation where one slip up means its over so for him his big brother who forgave him no matter what he did was like a sort of angel. mix a bro-con with a super warped narcisistic personality and BOOM you get this madness
ahh I see thank you!! (⌒▽⌒)
yuh np just sharing my take on it! idk if that's entirely correct lol(￣∇￣")
Need me a Daichi everyone needs a Daichi I hope yall find your Daichi one day too (=・ω・=) also I dont get the little brother why is he so obsessed with Mashiro? Can someone explain?