Amano Kusuha

The main character's home room teacher. She is a former programmer, and advisor of the “Sex Friend Club”.

She developed “Amano-iwato”, a smart lock application that is used throughout the entire school.

As a programmer, she was always up all night, her talents were used to her advantage, and she had no time for romance.

Since changing careers to become a teacher, she is frustrated on the inside by the daily display of students' love affairs.