Again I must start by mentioning that at this point in the drama I am pretty lost with some parts of what is going on. Some of it is easy enough to follow along based on what I can understand of Japanese and just the knowing the usual ticks for Japanese dramas from watching quite a few.
In the flashback we see (which is supposed to have happened seven years ago) we see the guy Hikaru met with last episode try to get Hiro to beat a dog with a lead pipe. Hiro does not want to and Hikaru, who was nearby with friends, hears that Hiro is in trouble and goes running. His friends show up later and find Hikaru with the pipe in his hand and the guy on the ground covered in blood with Hiro cowering nearby.
I really do not care for Hiro looking like an identical twin of Hikaru. In a way I can see it thematically making sense with the two perhaps being presented as two different sides of the same coin kinda thing, but it just is so implausible it comes off as silly. Especially when we have seen the two look so vastly different as children.
Either way though I have stuck with the drama this long I might as well see it to the end, and I would like to know how things unfold regardless.