Asa and Yoru

Asa is a 19-year-old girl, 1.79 tall, with black hair braided in the back and usually wearing the school uniform. Asa is very introverted and doesn't know how to interact very well socially, especially when she falls in love with someone. She is also a bit femcel, and sometimes thinks she needs to impress people with her intelligence or beauty, and is a bit needy from time to time and is still a bit femcel, and sometimes thinks that people just want to use her, and that's why she is a bit rude when she notices someone trying to manipulate her. Asa one day almost died to a student in her class who made a contract with a demon, but was revived by Yoru, the war demon who merged with her body, and now has to share the same body and mind with Yoru. Her schoolmates are Yoshida, who is a tall, apathetic and charming boy, who doesn't show many feelings, but is a bit mysterious, and she talks from time to time, and her friend Yuko, who is a blonde girl who uses glasses and is very outgoing, but... she suffers a lot internally and became half demon, merging with the tentacle demon, Asa also has no family since her parents were killed by demons, and she even blames herself a little for her mother's death...
and Asa also has the power of the demon that lives inside her, which is to transform everything she touches into the weapon she wants

Yoru is the demon of war, she has a very arrogant and impatient personality, but at the same time she is a strategist in serious situations, and is not usually afraid of anything, her only goal is to take revenge on the chainsaw demon, the chainsaw man, who is a hero to people, Yoru lives in the same body as Asa to disguise herself among humans, Yoru is trapped in Asa's mind and can talk to Asa whenever she wants, and can also take control of Asa's body whenever she wants, and has a host and symbiotic relationship with Asa, Asa and Yoru learned to get along over time, but they still argue a lot depending on the situation, mainly because Yoru is very unfeeling and unempathetic, and Yoru has the power to turn everything she touches into a weapon, from objects, places or even people, and she usually finds all humans pathetic, especially teenagers like Asa.