Seito Airi

While in Junior High Seito Airi was a lonely girl. She didn't have a single friend. She would usually eat her lunch on the roof of the school. One day when she was eating on the rooftop she met Hiiragi Seiichi. They were both loners so they got along well and even ate together. She is the only one who calls him Sei-chan. While talking to him everyday she started to develop feelings for him. He also calls her Airin. Seiichi said she would look cute if she dressed up, he also said that if she talked to anyone they would easily become her friends. She then dressed up for Seiichi and got more friends. She got many confessions but ultimately rejected them all because the only one she always liked was Seiichi. Then Seiichi began to avoid her because he thought that if everyone knew that she was friends with him they might avoid her. Then they began to see each other less often. But Airi kept her love for him. Even after being summoned to the another world she kept searching for Seiichi. Then she finally met him at the Academy and confessed her love together with Kannazuki Karen to Seiichi. After seeing Saria, his wife, the two of them decided to be his concubines because Polygamy is normal in that world.