Asuka Saionji

Youichi's classmate and childhood friend. Despite being the eldest daughter of a large and influential company's president, the way she speaks and acts would make anyone genuinely question that fact.

Being a bit of a meddlesome worrywart, she often visits Youichi—who lives alone—to help him with household chores. Although Asuka views the Space Club with much disapproval, she nonetheless ends up getting repeatedly entangled in their activities.

(Source: MangaGamer)