Kiyotaka and Peko have never interacted with each other in canon, as they both come from two different entries in the series. While the two did attend Hope's Peak Academy around the same time, it is unknown if they had ever gotten the chance to meet or even know each other.
Kiyotaka and Peko also don't share any events together in Ultimate Talent Development Plan.
The ship was mainly the result of both characters being featured together in a piece of promotional artwork for Danganronpa 1.2 Reload. The artwork featured Peko leaning in close to Kiyotaka, with the two of them wielding bamboo swords.
The image alone was enough for some fans to start shipping the characters, as it made them realize the visual similarities between them. Most notably, their red eyes. Some other similarities include how both characters wear traditional Japanese school attire, and are known for their strong sense of morality. Meanwhile, some other fans came up with theories and headcanons about how the two may be related, and possibly separated at birth.
As one may expect, the ship isn't popular, as the characters have never met in canon. Nonetheless, there are still some who like to speculate about the possibility that the two may have a connection in some way.
- As previously stated, both characters have the same eye color, red.