During Korekiyo's Free Time Events, he told Kaede about his sister, to the point that she more or less jokingly asked him if he is into incest. He seemed to get slightly angered by this and simply answered that incest is regrettable. Kaede apologized and told him she didn't mean it in a bad way, which quickly calmed him down.
Korekiyo likes Kaede and her optimistic nature very much and asks her to be his sister's friend. She agrees, and Korekiyo leaves to plan a good "method" for them to meet, heavily implying that Korekiyo might have murdered her in the future if she hadn't died so early during the Killing Game.
Kaede thinks Korekiyo is a bit creepy but assumes he is a nice person who cares about his sister. However, she is a bit unsure about it, as she doesn't know him well. She also assumes that Korekiyo is "so girly" because of his sister's influence.
Due to Kaede and Korekiyo not interacting much, the ship isn't all that popular. It's quite rare to see people ship this. But this ship was abandoned around Saimatsu, Amamatsu, Irumatsu, and other shippers that like Kaede with someone else other than Korekiyo. Same thing with shippers that like Korekiyo with someone else other than Kaede. Some of those ships being Amaguji and Shinnaga.
- Both were executed due to being the culprits/blackened. The only difference is Kaede was executed on false charges and Korekiyo was not.