>>280742849
I feel like his going through a cycle of grief and the monster is merely exploiting it. The monster is not Hikaru. It is a monster.
It might do shit similar to how arcueid affects Shiki. I guess we'll need more evidence of this though.
But he did trick Yoshi into thinking it was all normal at the start of ep 1, remember? We already know it's heavily fucking with his head.

To me, Hikaru is more like pic. That's the vibe I get.