Who is Kyoko?!?!
I see... I thought I had managed to remove her content from the public build, but I must have missed a step. The short explanation is that Kyoko's story was pushed to v9, and I planned to introduce her to Sim Akiramine in that version as well. As you suspected, that upcoming story is planned to focus on Kyoko and Orino.
(As for her inclusion in Sim Akiramine, Kyoko doesn't have anyone other than Orino as an option because I felt like the age gap between her and the rest of the cast would make most of the potential pairings difficult to believe. For some additional context, Kyoko actually originated in another of my stories from this setting, and her adopted daughters are about the same age as the main cast of this game.)
Hopefully that clarifies things a bit, but let me know if there is anything else that could use explaining. I hope that Kyoko's bonus content slipping through to the public build wasn't too confusing.