im not going to complain about other girls getting attention from the plot (they definitely should, the girls are the selling point), but its weird for the manga to act like theres an actual rivalry over kyougi. the only way it goes anywhere for jeanne is if it becomes a harem, but that would be weird given how the manga is named after kanan and shes already his gf. theres no way kyougi actually leaves kanan for jeanne, and any attempt to toe the line just makes kyougi look like a dickhead.
seems like the mangaka regrets blowing his load so early by having them start dating at the beginning of the manga instead of playing the harem game out the gate.