Heartwarming, focused on romance or 'journey' of relationship

'focused' on the journey of how the mcs develop their feelings for e/o (not like more on comedy w/ just a touch of romance, not more on friendship b/w girls, etc.). 

Something like Always, Doukyuusei (tho I'm not looking for shounen ai movie as of the moment)

Quite ok - Our Times, Crazy Little Thing Called Love

not heartwarming, but focus on 'journey' of MC - Bokura ga ita 1 & 2

https://mydramalist.com/6827-ugly-alert - many episodes, but they're short ~30 mins.