The protagonist of the series. He has feelings on first sight for the Ayanomine princess Erika, who he met on the first day at school. After Erika split into two personalities, he regards the golden girl (Erika) as the real deal, and treats the silver girl (Ginka) as the fake. Upon knowing that Ginka has no place to go after escaping from the Ayanomines, Noborou lets Ginka stay at his place, and learns how to "conquer" Erika from her. Over time, Noborou learns that Erika and Ginka are one and the same, and develops deeper connections with both of them.

Spoiler

After learning the secret of the Ayanomine family, he is forced to choose between both of them.