"Natsuya Kirishima is one of the main characters in the Japanese manga series ""Complicated Cohabitation."" He is a 25-year-old man and the protagonist of the story. Natsuya is a complicated character who is both strong and vulnerable at the same time.

Natsuya has been through a lot in his life and has developed a tough exterior to deal with the harsh realities of the world. He is a very independent person who prefers to keep his distance from others, but this changes when he meets the female protagonist, Ayane Konno.

Natsuya is a very handsome man with a strong and well-sculpted physique. He has dark, short hair and striking blue eyes that seem to pierce through people's souls. When Natsuya is not working, he enjoys spending his time exercising and keeping fit. This is evident in his well-built body, which he takes great pride in.

However, despite his tough exterior, Natsuya is a very caring and kind-hearted person. He has a soft spot for animals, especially cats, and often volunteers at a local animal shelter. Despite his past, he still believes in the goodness of people and tries to help those in need.

Natsuya is also a very determined individual. When he sets his mind to something, he will stop at nothing to achieve it. This is evident in his career as a successful businessman. Natsuya owns and runs his own company, which has become quite successful in recent years.

Overall, Natsuya Kirishima is a fascinating character who is both complex and intriguing. His strength and vulnerability make him a relatable character that readers can't help but root for. With his charming good looks and kind heart, Natsuya is definitely a character to watch out for in ""Complicated Cohabitation."""