We're in the middle of a chapters-long flashback to the time in middle school where Asuka has discovered the conflicted joy of bean flicking to the thought/scent of her mother, her mother has realized for the first time she was looking at her daughter like a snacc, and Asuka was subsequently discovered and is in the process of being preyed upon by a somewhat sinister player of a senpai--a situation that presumably ends poorly and perhaps causes some mental scarring. All of this to get us caught up to the present again, where Asuka has crossed paths with that same senpai, keeps pushing the envelope with mom, and has left all of us with Train Wreck Syndrome as we watch it progress to the inevitable incestuous carnal relations.