Believer! is an otome visual novel described as a "battle fantasy" where you play as a young sorceress protecting the world from supernatural threats. When a dimensional door opens and mysterious beings begin attacking, you discover your true role as a miko with special powers. Five guardian characters have trained their entire lives to protect you from these forces. Their fates intertwine with yours as you uncover the truth behind your mysterious abilities and the connection to the parallel world. The game features voice acting with prominent seiyuu cast and character routes averaging 2-3 hours each.