And even though you typed the exact title of the video you are searching for, it will never be the first result…

Last movie that made me cry was The Whale. I saw it in a theatre and rarely I had to refrain myself from crying in public this bad. Once I got home though I just bawled my eyes out.

Can confirm Your Lie In April made me cry like a baby. But I would say anime wise Violet Evergarden was even more cathartic. I ugly cried more than once watching it.