18+ Seiyoku Tsuyotsuyo The Animation

High school student Haruki Nanase dates Ryosuke. All her friends envy her, because Ryosuke is a real macho, and also an athlete. After some time, the girl becomes irritated and nervous. It's all about her boyfriend's selfishness in terms of sex, in which she receives virtually no pleasure. Nervousness grew every day, and to relieve stress, Haruki decided to make fun of the quiet Nazaki. Wanting to disgrace the guy, she pulled off his pants.