|Japanese name:||塩入 弥生|
Despite his jealousy of Ritsuka's close friendship with Yuiko, he is encouraged by Ritsuka's adamant claims that their relationship is purely platonic. He makes a firm statement he will not give up on Yuiko, and spends more time with her than ever.
It is notable that in the manga, Yayoi has a rather small role. He is absent for large parts of the story, and has only a small amount of dialogue. In the anime, they utilized his character much more to enhance the would-be Yayoi-Yuiko-Ritsuka love triangle, and to inject comic relief into a dark story.