Visual novels about the teenage girl Eriko:
The first episode is about Eriko and her ambiguous feelings towards her step-sister.
The second episode is about her sexual fantasies about her female teacher.
The third episode is about her participating in a cosplay. This episode have no adult content.
The fourth episode is about her relationship to another female student.
And the fifth episode is about how Erika wants to become irresistible to boys.