[plzd0ntkeelme]

Ep4 is great. I'm glad that it doesn't drop in terms of storytelling and plot from ep 3.

Spoiler for ep 4:

Hiromi was obviously telling a lie at the end of ep 3. Otherwise, she wouldn't be crying when Shin tries to make an excuse of why he's avoiding her.

Nobuse started realizing that Ai doesn't like him. But then Ai tries too hard to not hurt his feelings. It's frustrating watching her behavior.

As for the incest thing, it might be true if Jun was looking at Noe's face but he was looking at her neck. My guess is that he just feel sexually aroused and since Noe's his sister, he feels guilty with his perverted feelings. He then try to solve the situation by making Noe going out with Shin. Notice, being sexually aroused is different than falling in love.