KeppiSara

KeppiSara is the het ship between Keppi and Sara Azuma from the Sarazanmai fandom.

Canon
Sara explained via the scrolling text of her show that she is looking for her prince. She eventually finds it before the fifth episode, as she has a Keppi toolbox in her room. It's also revealed in that episode that she is, in fact, a kappa herself. In Episode 7, she is on a date with Keppi. Enta takes that opportunity to go steal the Dishes of Hope.

In the following episode, the couple both discuss about how Reo and Mabu got into the Otter Empire. Sara presents Keppi a machine that can freeze any youkai, so they can capture and interrogate the Otter. But, when Sara was preparing her meal, she put too much pepper which causes her to sneeze and send Keppi into the machine. Now with her boyfriend frozen, she tries to move it but accidently pushes him too far into a bus (which seems to be affiliated to the Otter). She tries to stop it but arrives too late.

So, she just put him back together. After a few mistakes, Keppi is finally able to go see Kazuki and Enta, saving the latter's life in the process. While the final battle is happening, Haruka tells Sara about the dreams he's been having. She responds that it's only up to those who seek connections to accept it to seal the fate of the world. Then, Haruka breaks the dish, which seems to indicate bad omens.

In the end, the Otter is defeated (for now). Reo and Mabu crowns Sara, and she transforms. She joins Keppi, and all the people of the Kappa Kingdom tells Haruka (and by extension Kazuki, Enta, Toi and the audience) how important the connections are and that it needs to be protected, no matter how hard it is (as some mistakes can happen when trying to protect it).

Fanon
The ship is quite appreciated in the fandom. The two have an endearing relationship, no matter how weird it makes you feel the first time you see them on a date. In the fandom, Sara is portrayed as a big spoon, and in many fanfics, Keppi is the one who gives birth to their kids.

FANDOM
Azuma Sara/Keppi on AO3