Shou Fukamachi

Shou is seventeen and lives with his father. He is in love with Mizuki, his best friend Tetsuro's sister. One day Shou and Tetsuro are walking back from school when they hear an explosion. The two friends, deciding to investigate, then discover a Guyver Unit, which attaches itself to Shou, turning him into a superpowered humanoid which becomes known as Guyver I.