Sono Otoko Wagamama nitsuki
その男、ワガママにつき
On her 17th birthday, a high school senior named Shiina attempts to enter a trendy club with friends. Inside, they meet the club's attractive owner, Makoto, who reacts oddly when Shiina shares her name. After she reveals her age, he refuses her entry. The following day at school, Shiina discovers that her science teacher is secretly Makoto.