her story expanded upon than what was seen in Ecstasy, which was itself an expansion on the story featured in Little Busters!. Kud Wafter begins at the onset of the summer vacation after the events of the peaceful field trip from Little Busters!. The other members of the Little Busters have returned home for the break, leaving Riki and Kudryavka to spend their vacation living at the school dormitories as they form a romantic relationship. However, the male dormitory is undergoing renovations due to a problem with the plumbing, leaving Riki without a place to stay. As Kudryavka has no roommate, she suggests to Riki that he live with her until the renovation on the male dormitory is finished, and Riki accepts. Riki and Kudryavka try to keep the other dorm members from finding out since it is against the rules for a boy and girl to share a room. Also living at the dorms is a girl named whom Kudryavka knew and was roommates with for a time in Kudryavka's home country; Yuuki is half Japanese, a quarter German and a quarter Russian. She is the president of the science club at the school and came to take part in a cultural exchange program. Every day, Yuuki is absorbed in various strange research projects and experiments and could be described as a logical genius. The head of the girl's dormitory is , the only main character other than Riki and Kudryavka to return from Little Busters!. While Kanata is good friends with Kudryavka, she is concerned about Kudryavka's relationship with Riki. Kanata succeeded the previous head of the girl's dormitory, a third-year girl referred to as . Since she resigned from being the dormitory head, the dormitory rules have become somewhat more relaxed, but she still aides Kanata because Kanata inherited the position. A-chan is the president of the home economics club, which Kudryavka is a member of, and she likes interesting and strange things. A young girl named is aiming to win a water rocket competition and she becomes friends with Kudryavka and Riki while searching for a suitable plastic bottle. Shiina is a cheerful, energetic girl without a hint of shyness around strangers. Shiina has a Welsh Corgi named Ōsumi as a pet. Her dream is to become an astronaut, but her family is against it. Her mother is a picture book author and she has an