Glass: The Movie

One after school, Sakurai - is told to stay behind by her female class president Shirokawa Yui. Not only does she lecture him and scolded him from bringing some lewd magazine, but she even challenges him. He has no choice but to accept, but while accepting her challenge one thing leads to another and things turn out the way he'd never expect them too... from a soothing massage to her first time sex with Sakurai.