Yuuki, Kei

結城桂

Kei is a young heir to a wealthy Japanese family, yet he appears to spend the majority of his time speeding around Graviton City on his motorcycle. He becomes infatuated with C-ko. Unbeknownst to him, both A-ko and B-ko are competing for his attention simultaneously.
Kei rarely speaks and possesses a strong fondness for Coke. In the fourth movie, his parents arrange for him to marry Miss Ayumi, although he remains captivated by C-ko.
In the alternate universe series, a short scene depicts Kei pursuing a relationship with both A-ko and B-ko, potentially at the same time. However, this is uncertain, as the narrative focus shifts back to the rivalry between A-ko and B-ko.