LoliPOP's Favorite

I didn't read previous comments so I'm not sure if this theory of mine is original. When I finished reading chapters I suddenly thought that the present alive twin ''Roku'' might be Kei. When Kei jumped off rooftop, Roku did too. I guess the one who is dead after this accident was Roku and Kei couldn't accept the truth, started to live like his dead brother, copied his looks but contiuned to have relationships with men. I don't think that Roku can have sexual relationship with men after seeing his brother having sex with others (I mean he puked when he saw it) or after his brother's death.
If I was Kyuugou sensei, I would end the story like that. Even if I think that this theory is true, I feel like crying and crawling on the floor while I'm begging my brain to stOP THIS EMOTIONS ╥﹏╥