There are 4 books in the Chi's Sweet Home series. The newest book is The Complete Chi's Sweet Home 4 which came out in 2016.

1
The Complete Chi's Sweet Home 1

Book cover of The Complete Chi's Sweet Home 1
Chi is a mischievous newborn kitten who, while on a leisurely stroll with her family, finds herself lost. Separated from the warmth and protection of her mother, feels distraught. Overcome with loneliness she breaks into tears in a large urban park meadow, when she is suddenly rescued by a young…
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2
The Complete Chi's Sweet Home 2

Book cover of The Complete Chi's Sweet Home 2
The Purrfect Presentation

Now collected in a larger three-volume omnibus Konami Kanata's Chi's Sweet Home is once again shattering all expectations and taking the comics industry by storm. This time The Complete Chi collects volumes four through six along with two more comics from Konami Kanata's FukuFuku: Kitten Tales series…

3
The Complete Chi's Sweet Home 3

Book cover of The Complete Chi's Sweet Home 3
Now collected in a larger three-volume omnibus Konami Kanata's Chi's Sweet Home is once again shattering all expectations and taking the comics industry by storm. This time The Complete Chi collects volumes seven through nine along with two more comics from Konami Kanata's FukuFuku: Kitten Tales series.

Volume 3 also…

4
The Complete Chi's Sweet Home 4

Book cover of The Complete Chi's Sweet Home 4
Fur the Well!

After six years in North America the Chi's Sweet Home saga has finally come to an end! Chi, Blackie, Cocchi and the rest will wrap up their adventures near Green Park in this final collection. But before Chi moves on to her new role as a 3DCG…