One day, Erika, who is practicing teaching at her alma mater, visited Masaki's house, a student who refused to go to school in her class. She was stopped by her teachers saying that she was not in the position of a student teacher, but she had an experience of being saved by her former teacher, and she wanted to save her students. She came for a home visit. However, as soon as Masaki welcomes Erika in, he makes her drink tea containing sleeping pills. Her uncle, who is a yakuza who appeared in the middle of her act, and his underlings, Erika and Erika.
