That episode showing Konata's mum was indeed very touchy and emotional. It wasn't really a funny episode but it was one of those sad and happy moments in Lucky star.
I assume that Kanata did die because of a disease but the anime or perhaps manga didn't really confirmed how kanata died. Theres an OVA coming out this summer so its possible that we might get to know a little more about Konata's Family/parents as well as how Kanata died. |