Summary
Rejoice! Katsuro Sumeragi has taken up the mantle of Kamen Rider Zi-O and begins his journey to becoming the greatest king in history. However, a traveler from the future warns the present that one-day Zi-O will declare war on not just humanity, but Heaven and Hell. It's up to Rias and her Peerage to watch over this new Kamen Rider and prevent that future from ever happening.