Hayase Nagatoro is the main female protagonist of the anime series 'Ijiranaide, Nagatoro-san'. She is a high school student known for her playful and teasing nature, especially towards her senpai, Naoto Hachiouji. Despite her mischievous behavior, Nagatoro genuinely cares for her senpai and often helps him come out of his shell. Her teasing is a way to express her feelings, as she finds it difficult to be straightforward. The series explores their evolving relationship, highlighting themes of friendship, personal growth, and subtle romance.