Yeah. I guess it got canned as that seems to be ending it in the middle. Wonder if Batan will end up with one of the guys.
Considering it's 73 chapters I wouldn't say "canned".
Botan's romance was never meant to be focused on but just a side while the relationship between the main characters after officializing them as a couple, a kind of development the majority of comics similar to this one fail to accomplish, was further examined.
A lot people like to use "axed" whenever their expectations are not met in regard to side characters — here we have naturally reached a conclusion as the two confirm their feelings as they enter high-school; anything else happening until they graduated and passed their exam was basically a filler.