"How can I come to believe in you...?"
|Occupation|| Student Teacher
|Relatives||Yui Mizushima (Twin sister, Deceased)|
|Anime||Episode 11: Gemini Part 1|
Iku represents the Gemini. He is currently a student teacher and is friends with the school nurse, Kotarou Hoshizuki, since they were children. Iku and his twin sister Yui were both born with poor health. They're parents were not home often and couldn't care for them, so Koutarou's parents took them in. They developed very strong bonds with Kotarou and Koharu Hoshizuki, his sister. However, Yui died while they were in high school. He was formerly the lead singer of a band that Tsukiko Yahisa liked, but destroyed his voice while overworking himself due to the pain of his sister's death. His band members turned out to be using him for money and promptly dismissed him when he could no longer sing. Iku lost trust in everyone until Tsukiko helped him gain it back.