Monster Musume: Everyday Life with Monster Girls (モンスター娘のいる日常, Monster Musume no Iru Nichijou) Chapter 28 is the twenty-eighth chapter of the Monster Musume: Everyday Life with Monster Girls manga series.
Written and drawn by mangaka Okayado (Inui Takemaru), this chapter was released in Japan on November 30th, 2014, by the Japanese publishing company Tokuma Shoten within the seinen manga and anime magazine, Monthly Comic Ryū.
Papi is worried about that she forgetting something. Rachnera finds Papi's envelope from her mother and shows it to both Miia and Kimihito. After reading it, Kimihito notices that there is something something else in the envelope. It's a picture of what seems to be like Papi with another man.
Kimihito finds out something new about Papi's forgetfulness: Papi's brain is only reset when she has taken more than three steps. If someone carries her, she won't reset and can remember things in a very detailed way.
Papi and her mother revealed more about the Harpy tribes and their rules:
Harpies are migratory birds and they go where they want and when they want. For this reason, when the Interspecies exchange program was launched three years ago, there were few Harpies interested in it.
There is a rule among Harpies never to be with one guy for a long time, instead mating with many different human males. However, as Papi's mother notes, most Harpies (including herself) forget this rule all the time, and those Harpies who do remember don't follow this rule anyway.