Gender: Male
Age: 16-17
Birthday: July 14th
Height: 169.7 cm
Weight: 57 kg
Eye Color: Brown
Hair Color: Light Brown

Yuuki Hase is a high school student who notices that his classmate Kaori Fujimiya is always alone. He endeavors to be her friend even after learning that she loses every memory of her friends each Monday.

Hase's easily seen trait throughout the whole series is his apprehensiveness. Instances in the media have depicted Hase is hesitant and almost fearful of moving forward and taking the first step. He is also quite simple-minded, as he can be pleased and displeased by very seemingly minor details. However, he is very headstrong and bold when he finally comes to a decision, and will not rest until he has seen his decision through.

Hase can get easily jealous and mindful of certain things, such as the instance when Kaori talked about Shougo so much that Hase was beginning to get jealous. In this regard, Hase is naive and impulsive, often acting before thinking when he is aggravated. He also sometimes jumps to conclusions, further worsening the situations he gets himself in.

However, Hase is kind by nature, and likes to socialize with people as a normal high-schooler would. He treats everyone with an equal amount of respect and kindness, save for people he has gotten to know better (except in the case of Hajime, they aren't quite friends.) He tries to be considerate and polite as much as possible, though there are instances where his emotions can get the better of him and this doesn't turn out so well.

(Source: Isshuukan Friends Wiki)