What's the AXE (a manga cancelled or cut short due various circumstances before reaching a satisfactory conclusion, mostly due to low sells) that has affected you more? speaking of yuri manga of course (it might take me forever if we talk about all) or cute girls doing stuff.
For me, Tsurezure Biyori was one... I loved the art, the main couple, the side couple and the support characters and before they could even return to school it was over! I was really sad.
Nanashi no Asterism was worse in the sense that I was seriously mad and enraged because of all the circumstances surrounding it.
Haru to Midori was another one that wasn't all that bad how it ended but it really makes you feel like they could've gone deeper with the characters and the ending was like "is nice but also cliche".
I don't even have the heart to read the ending of "An easy introduction to love triangles" Y-Y maybe I'll wait for the next Canno's work, but I feel bad for the author and the team translating it.