Kota's route is out on Rental Boyfriend! So far, I like it. They're using the "other woman" approach to create conflict in this route, which is okay. By other woman, I mean the MC has to contend with another woman for the bishie. Kota's innocent, silly and just plain adorable. Typically, I don't like the youngster persona but his plain adorableness is making things work. Plus he's over 18 so it's cool right? ;0)
The MC's heart hurts every time she sees another pretty young thing talking to him in a friendly manner--typical-- but not terribly annoying. I'm not sure I'm fond of this MC either. She's got a mouth on her at times, playing Miss Sassy, but can also be a total ditz. Supposedly, she's in her twenties, but really, her personality is that of a fifteen year old.
Going to keep going and see what happens. Let me know what you think of Kota.