Responses
It's a series, only that part of the next chapter is sometimes included in the previous. The order is: Otokogokoro (2 chapters), Koibitogokoro (6 chapters + omake), Koigokoro (2 chapters + omake) & Amaamagokoro. I guess Tokimekigokoro is just the omake, the ch 5.5.
They have most of them combined in http://www.mangago.me/read-manga/kokoro_kanda_neko/
This manga is same as: http://www.mangago.me/read-manga/tokimekigokoro/
So what is the real title?