Nagisa Usami

Nagisa is a high school yankee who claims that she suffers from a rare disease called "Usagi Sickness" which causes her health to decline if she feels lonely. She would not come to school as she didn't have any friends and would waste her time sleeping. She befriends Sewa, a classmate who sits beside her, after telling him about her sickness. She wants to make friends but people are afraid to approach her due to her yankee-look, whereas in reality, she has very childish behavior.