Kei Okazaki

 (岡崎 契, Okazaki Kei ) is one of the main characters in Collar x Malice. He is a 26-year-old Special Police officer in charge of protecting Aiji Yanagi.

History
Kei's parents divorced when he was young, but this did not terribly affect him. He had a close relationship with his step-father and little stress growing up. He eventually became an SP officer.

Two years ago, he was assigned to protect the prime minister after the SP learned of a plot to assassinate the politician. However, on that day, Kei and his coworker noticed that the SP plans had been leaked. The prime minister was under attack, and Kei hesitated to prioritize his mission because he wanted to save someone who was already beyond saving. This slight hesitation resulted in Kei's coworker dying to save him. Later on, Kei discovered that this every same coworker was an Adonis mole, who leaked the SP plans. Even so, Kei could not reconcile how they died for him and their true role in the assassination plot. From this point on, Kei resolved to have a "death with meaning." He hopes to find someone worthy of being protected, who does not flinch in the face of adversary and has a strong sense of justice. Once he finds this person, he wants to die for them.

Kei was assigned to protect Aiji Yanagi and his team. However, this is just cover for his true mission: to keep watch over them and report their movements back to the police.

Personality
Kei is usually calm and appears to many as an airhead because he doesn't care about what other people think, simply discarding any opinions that conflict with his. Kei is extremely protective of Ichika Hoshino and is willing to die for her, but also the reason he wants to keep living. He claims that he is a good liar.

He also really likes weird and unusually flavored snacks and sleeping.

Appearance
Kei is of average male height with silver hair with brown tips at the end. He wears a regular police outfit with an SP badge attached to his jacket. His black colored jacket hangs on one of his shoulders, falling. His iconic sleeping mask hangs from the black strap near his hip