In her first year of high school, Chisato tried to help Mizuki out, who had a hickey on her neck, by offering to cover it up with a bandage, though Mizuki did not want her help.
I deres første år i gymnasiet prøvede Chisato at hjælpe Mizuki, der havde et mærke på halsen, ved at tilbyde at dække det med et plaster, men Mizuki ville ikke have hjælp.