When Centorea hears this, she is immediately determined to dispose of the supposed danger, even though what Manako meant by "strange" was the fact that Centorea is wearing her full centaurean armour. When Centorea asks her if she sees something strange, Manako first denies, but then hesitantly says that she is already seeing something strange.
However, the phone call comes from Manako, who is observing Kimihito and Centorea as surveillance leader from a rooftop. When Kimihito receives a phone call, Centorea requires him to give her his cell phone, fearing it might be a "scam call". In the early morning Kimihito walks through Tokyo with Centorea, whereby Centorea acts overprotectively towards her "master" (much to Kimihito's embarrassment) by warning him not to walk on the street side or by getting rid of passers-by. The chapter was later gathered as part of the series' tankōbon volume Monster Musume: Everyday Life with Monster Girls Volume 5.
Written and drawn by mangaka Okayado (Inui Takemaru), this chapter was released in Japan on January 11th, 2014, by the Japanese publishing company Tokuma Shoten within the seinen manga and anime magazine, Monthly Comic Ryū. Monster Musume: Everyday Life with Monster Girls (モンスター娘のいる日常, Monster Musume no Iru Nichijou) Chapter 21 is the twenty-first chapter of the Monster Musume: Everyday Life with Monster Girls manga series.