__Relatives:__ Keiichiro Kamo (Older Brother).
Sadaharu is a close friend of [Jirou Yakuin](https://anilist.co/character/191673/Jirou-Yakuin), being one of the few people Jirou is comfortable being open around. He is paired with Satsuki Kaneyama in their school's Marriage Practical.
Sadaharu is portrayed as being a mild mannered and eccentric otaku who enjoys reading manga, watching anime, and playing video games. Like Jirou, Sadaharu also has lousy luck with women, preferring the women to be "2D" instead of real so they can't end up hurting his feelings. However, it appears that he and his practice partner get along well which indicates that the practical has somewhat improved his social skills with women. Sadaharu is considered to be the series primary comic relief character, having a knack for making light of serious situations by comparing them to similar events found in many Japanese media and pointing out common tropes. He often showcases incredible creativity by imagining himself or others in fictional circumstances that almost appear to break the laws of reality, with his rampant imagination even causing him to the break the 4th wall on a few occasions. Despite his absurd antics, Sadaharu is ultimately a good, kindhearted person and will go out of his way to help and support those he cares for when he sees fit.
