"Kazuya is one of the main characters in the manga ""Heavenly Moon"". He is a 17-year-old high school student who leads a double life as a vigilante known as the Moonlight Samurai.

Kazuya is a tall and slender young man with black hair and sharp features. He is calm, collected, and reserved, always keeping his true feelings hidden beneath a stoic facade. However, his sense of justice and determination are unwavering, and he will stop at nothing to protect the innocent and bring criminals to justice.

As the Moonlight Samurai, Kazuya dons a distinctive suit of armor and wields a katana. He is a skilled swordsman with an unyielding spirit, and he is feared by both criminals and corrupt officials for his relentless pursuit of justice.

Despite his serious demeanor, Kazuya has a softer side that he only shows to those closest to him. He cares deeply for his family and friends, particularly his younger sister, and will go to great lengths to keep them safe. He also harbors a deep love for his childhood friend and fellow vigilante, Hikari, though he has trouble expressing his feelings to her.

Kazuya's journey as the Moonlight Samurai takes him on a perilous path, as he faces powerful foes and grapples with the moral complexities of his vigilante actions. Throughout it all, he remains steadfast in his commitment to protect those he loves and uphold justice.

In conclusion, Kazuya is a complex and compelling character who embodies the ideals of courage, justice, and sacrifice. His unwavering determination and commitment to his beliefs make him a formidable force for good, and his struggles and triumphs are sure to captivate readers of ""Heavenly Moon""."