this got me gaggin during the first chapters, its really fvcked up but as expected. It really shows how all the events that happened during Yui's childhood shaped the way he acts now, and I'm sure (as the end showed) that he realized that what his life is not good or "normal", he recognizes it at the end and becomes a little like Kei. Reading this made me extremely uncomfortable but it was also interesting as an psychological manga.
Nii-chan (harada)