Seiyoku Tsuyotsuyo The Animation (Series)

High school student Haruka Nanase dates Ryousuke. All her friends envy her, because Ryousuke 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 Nozaki. Wanting to disgrace the guy, she pulled off his pants.