The story in pages 33 and up feature the Three Girls Gang (Sugar, Ginger and Pepper) that appear in something like 3 episodes of the Urusei Yatsura TV series. Some info about them at https://uruseiyatsura.fandom.com/wiki/Three_Girls_Gang, https://uruseiyatsura.fandom.com/wiki/Sugar, https://uruseiyatsura.fandom.com/wiki/Pepper and https://uruseiyatsura.fandom.com/wiki/Ginger.
The second story (pages 27-32) is a incest one, as it features Asuka Mizunokouji and her brother Tobimaro Mizunokouji. See https://uruseiyatsura.fandom.com/wiki/Mizunokouji_Asuka and https://uruseiyatsura.fandom.com/wiki/Mizunokouji_Tobimaro for info about them.
Just speaking to show off that we watch old ass anime.
The Three Girls Gang are a group that tries to surpass the pranks of their seniors (which are Lum and her alien friends). They fail every-time of course but the fact that they are here and not Lum's friends (a biker chick and a snow maiden) is a great injustice.