Found this episode a bit easier to follow, it probably helps that it is rather straight forward with what is covered in this episode that ends up clearing more up than adding much more to the mystery.
We do learn some key information, like clearing up the person Origuchi was talking to on her cell that Yanai assumed was a boyfriend was just Akito. But the topic of a painting come up and Miyamoto has brought it with him to show everyone. It was something special to Origuchi but I was not able to catch what she said about it in the flashback where she talked to Miyamoto about it.
The preview is pretty vague, so I think it is safe to say that they are making sure the viewers do not get enough to be able to guess what exactly will be covered in the next episode. That said, those waiting for the episode where members of Junior group Snow Man will be in will only have to wait until the next episode, as one of the members is shown in the preview.
We have gone down the list of suspects that we were introduced to in the first episode so there really is no other possibility to explore than Narumi not being completely truthful about his relationship to Origuchi when Mizuho asked him about it. But we should have more than one episode left so I feel like I cannot really speculate how things are going to go. I think it is safe to say though we will get the resolution of Origuchi's mystery with Narumi's now.
I am glad there was a way to make this progression feel natural and even though everything feels like it just circled around everything Mizuho has learned and gone through so far has done so much with investing care towards having this mystery solved with making Origuchi a much more complex character that could be cared for.
And I am so glad that Matsumura Hokuto has his role in this drama. I have been hoping for him to get a role that has him get away from the "cool" type character and surprisingly Yanai is that role. At first glance it did not seem that way but once we got past the surface of his character he has shown quite a bit of emotion and it is roles like this that I think will really help Hokuto grow as an actor at this stage in his career.