Katakura Saki

The protagonist's childhood friend. Very good at cooking and housework. Knows about the slovenly side of the protagonist and will often take care of him. She is a national level tennis player and the tennis club's ace. Once when she was very upset at not being able to participate in a big tournament due to an injury, she was comforted by the protagonist. Attracted by his gentleness, she confessed to him. She is a sports science student in name, but in order to become closer to the protagonist, she secretly took the general science exam. This spring she became a general science student and the protagonist's classmate. Because she is afraid to damage her relationship with the protagonist, she is unable to take the crucial step, and is secretly looking forward to the advancing of their relationship.