That'd be hella interesting. It's like Ryougi Shiki or something. But so far, it's high likely not because there was a confirmation from the mother of Yushin. Then again, that's prolly one of the wildly interesting premise ever.
So far, everybody is either innocent with their own problems or feigning innocent, which is natural/what they suppose to do. The last page indicates finally we're getting somewhere so idk we'll see i guess...