Wow! After this episode, a few things seem clear or can be suspected:
It's surprising that so early on, it seems clear that Lucy and Kohta have a past, so I hope it's more complicated than that. I think we'll definitely find out why Kohta can't remember much, what the music box means and why this whole drama plays as a background to the blossoms of Yuka and his relationship...
- Lucy is Kohta's sister (and presumably killed his/their parents?)
- the guy with glasses at the prison (Kazuma?) seems to have close ties to them. Is he the father? He claims he killed his daughter (because she's like Lucy or Nana?), but seeing that he didn't kill Nana, maybe Lucy is his daughter and he let her go?
It's surprising that so early on, it seems clear that Lucy and Kohta have a past, so I hope it's more complicated than that. I think we'll definitely find out why Kohta can't remember much, what the music box means and why this whole drama plays as a background to the blossoms of Yuka and his relationship...