Tamao is first introduced as Nagisa's roommate. She plays a major role in this anime, as she eventually falls in love with Nagisa. She is shown as overcheerful and takes a large interest in Nagisa.

Tamao has a nice, helpful personality and sometimes enjoys gossiping about other people when it comes to matters of love and attraction.

Highly literate, she is a member of the Literature Club and loves to write poems. She writes the script for Astraea's adaption of Carmen. She is well-regarded among her fellow Miator students; many of the first-years see her as a viable Etoile candidate.