Mirei is a bossy girl who gets easily irritated at Jurai Andō, because of his chūnibyō antics.

She also mistook a letter from Andō as a love letter and falls for him, but ends up getting rejected. However, she still tried to stay cheery and tried not to cry, but in the end, she cried while she was smiling.

She had a very sweet and cute personality when she thought that Andō had given her the love letter. She even changed her email address to "MireixJurai = Forever Love" while being a bit stalk