Asama Haruhi

The protagonist’s twin sister and a second-year student at the academy.

As her name "Haruhi" (which means "clear sun") suggests, she has a bright personality and is a cheerful, well-liked girl at school.

Despite being twins, she and the protagonist look so different that people often point it out. Each time, she firmly insists that they are fraternal twins.

They used to be very close, but at some point, Haruhi began to worry that always relying on her brother might be a burden to him. Troubled by this thought, she has recently started keeping her distance or adopting a more teasing attitude toward him.

However, deep down, she can’t bring herself to truly dislike or push him away, leaving her stuck in an awkward, conflicted state.

As a result, to outsiders, she ends up acting like an elementary schooler teasing their crush. This has only made things even more difficult for her brother, though she remains unaware of it.