This is based on opinion. Please don't list it on a work's trope example list.
Tear Jerker / Kashimashi: Girl Meets Girl
The last episode, where Hazumu and Tomari say their farewells at the river, is a heavily emotional ending to an already pretty melodramatic plot. Too bad the makers managed to screw it up with that silly OVA they released later.
At the end of the manga when Hazumu and Tomari hook up. It seems as an Ass Pull considering most of the manga was spent on the opposite pairing, and then we see Yasuna at the doorway. She's trying best not to cry, but ends up crying anyway.