Mizuki Kaho (´Ñ·î²ÎÈÁ) is a mysterious teacher who came to Sakura's school.
However, Kaho had met Touya a few years ago.
When Touya was in junior high she taught his math class as
a student teacher. Touya confessed to her and they were going out,
but she had to go abroad to study. So they ended their relationship.