Kai Xin

Kai Xin is a high school student who is always getting into trouble. He has a brown hair and is a teenager. He is the protagonist of the anime series "Ani ni Tsukeru Kusuri wa Nai!". Kai Xin is a mischievous and rebellious teenager who loves to play pranks on his older brother, Riku. He is also very protective of his younger sister, Yui, and will do anything to keep her safe. Kai Xin is a very intelligent and talented student, but he often gets distracted by his pranks and other misadventures. He is also very popular with his classmates, who admire his sense of humor and his willingness to stand up for what he believes in. Kai Xin is a complex and well-developed character who is both relatable and entertaining. He is a great example of a well-written protagonist who is sure to keep viewers entertained.