"Do you just wanna be friends or something else?" "Can we be down to earth with it already?" "I guess so..." After a mysterious death of both parents, Katsura Sonia had moved in with her cousin, Tetsuro Kuroo where she met his best friend, Kozume Kenma. 7 years later, they start at Nekoma High where Kenma and Kuroo join the Volleyball team. Kenma convines Sonia to become the manager of the team which makes the relationship a bit more complicated. After graduation, Kenma and Sonia decided to split up and follow their dreams but that takes a turn for the worst when she finds out the murderer of her parents after. While Kenma is enjoying all the money in the world, Sonia goes into a pile of despair, but when she finally makes connection with her old best friend, she makes the move to live with him as roommates... or something else between them?