18+ Yankee Musume ni Natsukarete Kotoshi mo Juken ni Shippai Shisou desu

19-year-old Shibao Endou, a high school graduate and currently a ronin, suddenly stumbles upon a beautiful young girl dressed in a biker gang uniform. After forcing him to hide her from the pursuing police, and he ended up losing his virginity by chance! The start of exciting and stormy days of Shibao Endou and a delinquent girl's secret love story!

(Source: Shonen Gahosha, translated)