An associate professor of architecture at National Nagano University. He has gained the good will of Moe, but he doesn't particularly care about her. He is extremely intelligent, he has detached himself from the world, and he doesn't care at all about fashion. He loves coffee and cigarettes, but he hates watermelon, red beans, and soybean flower

He is the older brother of [Setsuko Gidou](https://anilist.co/character/180419/Setsuko-Gidou)





The story of the original Subete ga F ni Naru novel revolves around Souhei Saikawa, a member of the Saikawa Research Lab. He goes on a vacation held by the lab, and Moe Nishinosono, the daughter of his mentor, joins the group on their vacation despite not being a part of the lab. There, the two end up finding a corpse. The two work together to solve the mysteries of what becomes a serial murder case.<br>
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(Source: Anime News Network)

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