- Tetsuro Segawa
- 178 cm
- High school student
- Best friend
Tetsuro Segawa, the main hero's best friend and the brother of Mizuki Segawa, is an 18 year-old high school student of Narisawa High School. He is the run-of-the-mill high school geek, with a great passion for Science Fiction books and movies. During his spare time, away from his studies, he is a writer for his high school's Sci-Fi club. Being the older brother of Mizuki Segawa, he is sometimes known by his little sister as being called, "big brother" or "bro". To some of his close friends and family members, he goes by the name, "Tetsu", for short.
Since the days of his early childhood, Tetsuro has been the best of friends with the storyline's main hero, Sho Fukamachi. While growing up, they had been through many memorable experiences throughout their childhood together. However, after falling victim to the horrific reality that he now faces, Tetsuro aids Sho using his strong intellect and knowledge of Science Fiction in the war with the Kronos Corporation, all for the sake of his loved ones and for the rest of humankind.