We got Ucchi, that's good.
This and the extra, authors do casually like to throw in dumbfounding scenes. The scene between Koharu and Sacchi was bordering dirty, much like the other publications of Tanigawa Nico, but unforeseen in Watamote. Apparently we can say that Sacchi is into it and the others made Koharu into a teen-like curious point. As specific as it may be, I think this is the first time these two are having an open conversation? Sacchi is not deflecting, nor manipulating the conversation so as to guide it towards her secret interest, but straight up pointing to it. Much to everyone's surprise, Wada's degenerate ways are advancing the plot?