The Anime Lad
Sixteen-year-old Godou Kusanagi becomes a Campione, a mortal known as a God Slayer. The title carries a duty to confront deities that intrude on the human world. It also attracts the attention of knowledgeable followers, including the forceful sword-wielding Erica. Godou's ordinary schedule is no longer authoritative.
Gigguku
Godou is sixteen and already stuck with a title that makes divine conflict part of his responsibilities. That is gloriously excessive. Erica understands the supernatural world far better than he does and has no intention of staying politely distant. Myth and romantic pressure arrive as parts of the same unwanted promotion.
Father's Basement
The female following is built into the sales pitch, and the romantic comedy is rarely subtle about it. The useful distinction is Godou's title. A Campione exists to confront gods, giving the supernatural fights roots in mythology instead of relying on anonymous magic. That distinction gives viewers a cleaner reason to stay.