Though there are plenty of cute or perfect anime couple, this pair reminds me of HATSUKOI fantasia.
They are just normal.
They do not exaggerate things.
They do not spend lots of money just for him/her to be appreciated.
THEY ARE PURE. (Yes, it's hard to find such anime now, especially many are into ecchi genre)
KAZEHAYA SHOUTA AND KURONUMA SAWAKO
from Kimi ni Todoke