Tag: Protagonist's Sister-in-Law as a Heroine
One or more of the heroines is the protagonist's sister-in-law.
Sister-in-law refers to the sister of protagonist's wife, or the wife of protagonist's brother.
In rare instances it may also define the relationship between people who marry siblings and refer to the wife of protagonist's spouse's sibling.
Protagonist's Brother's Wife as a Heroine
Protagonist's Wife's Sister as a Heroine