IA's little sister.My little sister is here.Her name is ONE-chan. It's not pronounced "won", but "oh-neh".ONE-cha...O...Oh, that part is...So cute!What is this...There, there.As the older sister, I've got to act strong and do my best!!Not a shallow TakahashiSasara-san, I have a question...Came too lateONE-chan is a reliable person who wholeheartedly completes tasks passed down to her as a new person.ONE-chanShe's a reliable person who can work well, but once in a while she fawns over me.Not a single person took a liking to IA-san behaving like an older sister.