Well, this chapter is actually an allusion or pastiche about Yama no Susume. You can see Ibuki wore the same clothes as Aoi, as did the bear's plot.
If you roughly browse the author's previous illustration works, it is easy to recognize that the author almost draws Ibuki similar to Aoi on purpose so far as Ibuki is simply an adult version of Aoi: Lack of social skills, gloomy and have some weird preferences.
And author literally joins in the animation producing of Yama no Susume.