Rita is Mashiro's roommate and handler when Mashiro was in England. Despite her being the same age as Sorata and Mashiro, she has a better figure. She was jealous of Mashiro's art talent, and so advised Mashiro to draw manga, but later she regrets this and comes to Japan to bring Mashiro back to England. After realizing Mashiro's determination, she gives up and returns to England with Mashiro's father and starts to study art again. She falls in love with Ryūnosuke and kisses him on the cheek when leaving, which makes him pass out. Ryūnosuke is cold to her, allowing his Maid AI to handle her e-mail, which only fortifies her resolve and makes her constantly argue with Maid over the Internet. In the fifth novel, she visits Japan again to give Ryūnosuke Valentine's Day chocolate, and catches a chance to kiss him on the lips this time, which makes him pass out again. She moved in to Sakurasou after Nanami left.
Jin is the resident of room 103. Jin is a third-year student of Suiko. He is Misaki's childhood friend and a playboy. He has dated several girls, including Misaki's elder sister, but in the end he breaks up with all of them. He then wanted to attend a university in Osaka to achieve his dream. He even gives Misaki a marriage registration form to be handed in after he returns from Osaka but Misaki turned the form in immediately after Jin left and so the two are officially married to each other ^_^
Mashiro is the female protagonist of the story. She is the resident of room 202. She is a world famous artist who transferred into Suiko as a second-year to learn how to draw manga. Although her artworks are widely admired by the world in spite of her young age, she knows nothing other than drawing, and has an extreme lack of common sense and living ability. Due to this, Sorata has been forced to handle Mashiro's living chores, to the point that he even has to pick out underwear for her, or she will go out without them. She has very bad grades, since she cannot pay attention to her classes, but she can still pass the make-up exams by remembering all of the answers with her art talent. According to Mashiro, she plans to live in Sorata's house and work as a manga artist after her graduation. Mashiro is actually from England along with her sister Rita Ainsworth (リタ・エインワーズ).
Nanami is Sorata's classmate, who later moves into Sakura Dormitory's room 203. Although she is harsh to Sorata, she actually has a crush on him, and everyone aside from Sorata has noticed this. She escaped from her home to become a voice actress, and has to live on her own. After she finds herself low on money to live in the normal dorm, as well as noticing that Sorata and Mashiro are getting close, she chooses to move into Sakura Dormitory. She was able to convince her parents to let her continue her pursuit and returns to Sakura Dormitory for her final year of high school. She speaks in Kansai dialect if she is angry or flustered.
