Why the final season of 'Girls' is a heartbreaking must-watch

Mark Schafer/HBO"Girls" stars, from left, Jemima Kirke, Zosia Mamet, Allison Williams, and Lena Dunham.I'm under no illusion that I can easily convince someone who has never watched "Girls" to tune in now that the HBO show is about to air its series finale on Sunday.

But I know the show has lost some viewers over the years - and I get why - and this is my appeal to those viewers to come back on board for season six.

Every season, I approach "Girls" having prepared myself to be annoyed by Hannah (Lena Dunham) and her similarly self-obsessed friends. There's clueless Marnie (Allison Williams), who's obsessed with becoming famous, and has left a trail of broken hearts along the way. And self-destructive Jessa's (Jemima Kirk) antics were starting to get really old. And when were they going to realize that Shoshanna (Zosia Mamet) was the smartest person in the crew?

I have been greatly surprised and moved by this season, though. Here are the reasons you should you come back to watch the final season of "Girls":