Asuna Ayase is a character from the first two episodes of Shigofumi. She plays a secondary role in the first episode but is the primary character in the second.
Asuna is friends with Shota Machiya and the two often hangout together after school. In episode one it is revealed via a shigofumi that Asuna murdered her father. When Shota hears of this, he doesn't believe it but Asuna murders him anyways.
In episode two we find out that her father was forcing her to work in the sex industry. She was able to tolerate this but she murdered him when she overheard him expressing a desire to get her elementary age sister, Miku Ayase, into the industry as well.
After fleeing town, Fumika delivers a shigofumi from Shota to her. His words touch her and she wishes to finish building and launch the rocket that Shota planned on launching with her. She proceeds with this plan but the police begin to close in on her. There are complications with the launch and Asuna rushes towards to rocket to fix these so that she can see it launch before the police arrest her. The police assume that she is trying to attack them and fatally wound her. As she dies she is able to see the rocket launching.
After death, she writes a shigofumi to her little sister but the contents of the letter are not revealed.