As both characters are from different series, they have never interacted before. Thus, they have no canon relationship. In their respective series, they are similar because they're both female high school students in a death game. Both are also the protagonists of their games.
This ship is quite the rarepair, mainly because they come from two different series, with only minor similarities between them. Thus, why this ship is rivaled by more popular ships for the two, such as Saimatsu, Irumatsu, Joesara, and Keisara.
However, the two have quite a lot of similarities, even besides them both being female protagonists of their respective death games. They both have felt the guilt of feeling like they have betrayed someone they've cared for, with Kaede fearing that she had accidentally killed Rantaro while trying to kill the mastermind behind the killing game, while Sara being tormented by her own hallucinations after she couldn't do anything but watch her best friend suffer until he died. They also have quite a lot of similarities design wise, such as them both wearing purple socks, both having purple eyes, both wearing dark purplish-pink skirts, both wearing neckties, and both having brownish-grey shoes.
They are also both considered the leader type, and often blame themselves when things go wrong, even if it isn't necessarily their fault. They also are very well liked by their peers, and the others seem to depend on them in most situations. For example, in the first Main Game of Your Turn To Die when Shin Tsukimi accuses Sara of working with the kidnappers, almost everyone in the rest of the cast defends Sara. With Kaede, when Shuichi Saihara accuses her of killing Rantaro, majority of the cast says they can't believe it and that Kaede is too kind to kill anybody.
Another reason people might ship this is because of the constant comparisons to Danganronpa and Your Turn To Die. Since Kaede was seemingly the only female protagonist in a killing game until the switch in the middle of the first trial of New Danganronpa V3: Killing Harmony. As said before, the constant comparisons to both games caused some to ship this because of it.
|SHIPS||het||Joesara • Kaisara • Keisara • Naolice • Ransara • Ryojoe • Soukanna • Sousara|
|Joemaru • Keimishi • Keishin • Qkai • Soushin|
|Naoreko • Naosara|
|Kizuchi Sisters • Yabusame Siblings|
|CHARACTERS||m / f||Sara Chidouin • Shin Tsukimi|