Side stories (not absolutely necessary to read them) -
http://www.mangago.me/read-manga/cat_dogs/
http://www.mangago.me/read-manga/gattendou_tenmatsuki/
http://www.mangago.me/read-manga/before_daylight_love/
http://www.mangago.me/read-manga/after_morning_love/
Sequel: Paradise View
Sequel Kimi To Parade
sequel:
Fake Fur
sequel:
Emotion Circuit
Related to :
Don't Cry Baby
Related to :
Meguriau yo, Baby
Crossover Love