A girl with the special ability to use sounds waves produced by singing to fight Phantoms. She is always seen with headphones. She prefers to operate alone since she was alienated as a child due to her powers manifesting at a young age. Possessing strong powers as a child, it caused many of her classmates, friends and even her parents to be afraid of her.
She is a voluptuous member of the Railway Public Safety Crew under the Forth Peacekeeper Squad or K4. Though not physically strong and a bit clumsy, she is very intelligent, knowledgeable, and a top scorer in various academic test. It is suggested that she has feelings for Takayama.
A princess who came from another planet, where she is a member of the nobility of the Fortorthe Empire. Her choice for picking Koutarou's room was merely random, however as part of her trial to her empire's throne she has to make any occupants in that randomly picked area to swear loyalty to her, which much to her chagrin, didn't end up well and even found herself violated (accidentally) by Koutarou. She has a habit of using the first person personal pronoun 'Warewawa" or "Wagawawa" which is often used by Japanese belonging to the nobility in reference to one's self. She and Koutarou are often at odds, she also thinks highly of herself that she refers to Koutarou as "Neanderthal"; however, Koutarou also calls her "Tulip" in reference to Sanae's move when she is flipped her long skirt to put her in an embarrassing restrained. She is in the company of her servant, Ruth, who serves as her companion and adviser. The dress she wore also serves as her malfunction tool that she calls "Blue Knight" which can also transform into a weapon. (Source: Anime+)
Daughter of a well-connected Bakufu official's family, Hasegawa Taizou 長谷� 泰三, who was from a poorer samura needed family, married into her family. Willing to humble herself for her husband's sake, she knelt to beg for forgiveness on her husband's behalf (for dressing inappropriately to work) at his superior's house, even though the superior is of lower social rank than her own family.