Originally, Kyoko and Godai's relationship wasn't going to be the basis of the story. Rather, Rumiko Takahashi, the creator of the comic the series is based on, was going to end the storyline early on and continue on with a series of other storylines centering around the building's other occupants. However, the romance storyline proved so popular it became the basis for the entire series in both comic and television form.
The surnames of many of the characters are derived from Japanese numbers: Ichinose - "One/first rapids". Mitaka - "Three hawks", Mitaka is also the name of a wealthy area in Tokyo. Yotsuya = "Four valleys", shares a name with the Yotsuya district, name famous in a Japanese ghost story. Godai = "Five generations". Roppongi = "Six trees", Roppongi is also a famous nightclub district on Tokyo. Nanao = "Seven tails". Yagami = "Eight gods". Kujo = "Nine streets", Kujo may also a play on "Cujo", the Stephen King book.