In the beginning, Hiromi is portrayed as antagonistic to Nagisa, being extremely controlling of Nagisa's life. She forces him to keep his hair long, and makes him wear female outfits despite his dislike of it. When defied by others, she bursts into loud fits of rage, like when she yelled angrily at Koro-sensei. Later though, she becomes more lenient with Nagisa especially when her son saved her life from an assassin hiding to attack Koro-sensei. Since then, the two appear to be on better terms.