One of the main heroines in Amagami. Rihoko is always concerned about her weight, and likes eating sweets and sleeping in. She is also childhood friends with Junichi.
Rihoko is a member of the tea club. Rihoko and the other two members usually spend the time after school drinking tea and eating snacks. Rihoko is concerned about being too fat and often talks about going on diets and is embarrassed about her weight. However she often breaks her diet restrictions soon after starting them because she gives in to the temptation of eating sweet baked snacks.
In Rihoko's arc in Amagami SS, Rihoko gets closer to Junichi by persuading him to join the tea club. Rihoko isn't really sure how to get closer to Junichi, seeing as they have been childhood friends for so long.