"Kazuki Yasaka is one of the main characters in the Japanese manga series ""My Three Thousand Years To The Sky"". He is a high school student who lives in the fictional city of ""Neo Kōbe"". Kazuki has short black hair and wears glasses which give him a nerdy look.

Kazuki is a hardworking and dedicated person who takes his studies seriously. He is very intelligent and loves to solve various scientific and mathematical problems. Despite being a nerd, Kazuki is also a caring person who always tries to help others when they are in trouble.

Kazuki is an avid fan of astronomy and spends most of his free time stargazing. He is even a member of the school's astronomy club. Kazuki is fascinated by the mysteries of the universe and dreams of becoming an astronaut one day.

Kazuki's life takes a sudden turn when he meets a girl named ""Sora"" who claims to be an ""angel"". Sora tells Kazuki that he is the only one who can help her find her way back to heaven. From that point on, Kazuki's life becomes entangled in supernatural events, and he finds himself fighting against celestial beings.

Kazuki's journey forces him to confront his fears and overcome various obstacles. He learns to be more confident and assertive, and also develops romantic feelings for Sora. Kazuki shows immense courage and determination in his quest to help Sora and also saves his friends from danger.

Overall, Kazuki Yasaka is a complex and well-developed character who undergoes significant growth throughout the manga series. His dedication, intelligence, and caring personality make him a lovable and relatable protagonist."