アキ

The second sister, she attends the same high school as main character. Like her sister, she is an idol at school because of her appearance. She is someone who can be relied on by her peers because of her straightforward personality and because she is also the head of the track team. When stress builds up, she plays pranks on the main character to relieve it. Whenever she appears in front of her younger brother, she always has a different guy with her, but in reality... [From archived official site]