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. The teachers stopped him saying that it wasn't something he could do as an intern teacher, but Erika had the experience of being saved by his former teacher, and wanted to save the students himself, so he came to visit the home. However, as soon as Masaki welcomes Erika in, he makes her drink tea containing sleeping pills. The uncle who is a yakuza who appeared in the middle of the act and his subordinates thugs and Erika are exhausted.