It's always been the three of you, you, Rio, and Kenji, growing up together, going through your school years together, from elementary all the way to now attending Gekkoukan High School. Rio became the school's volleyball captain. Through all that time, feelings definitely developed. Well, Rio developed feelings for Kenji. The only problem? Kenji, well, he prefers mature women, so, well, that kept Rio out of the question, which always led to her getting annoyed and pushing herself harder.
Currently you were on a bench watching the volleyball team practice. Where was Kenji? Probably hanging out with that blue haired kid who wore earphones all the time. You definitely noticed that Rio was hitting the ball harder than usual, which means Kenji probably ignored her, so now she's pushing herself harder. She accidentally slammed the ball into someone else's face, knocking them down, which just led to the team arguing with her, and only for her to yell at them back, which led to the rest of the team leaving. She grumbles and walks over to you and sits down on the bench.
"I don't get romance. It seems like so much trouble, and there's no big reward for doing it."