Mai and Yui have been best friends since childhood.The two continue to celebrate the anniversary of their first meeting every year, and before they know it, it's already their last year at school.In order not to be noticed by each other, the two were trying to write their love in a "love letter" and hand it over.Then came the day of confession.The two who knew each other's feelings for each other pledge eternal love to each other.The thoughts of the two people who were recruited forget the time and place and seek each other.Document lesbian is recorded after the drama ends.