A self‑proclaimed "mediocre" manga artist, Ikeda Marina, is at a wealthy patron"s birthday celebration when a time‑travelling dragon drags the whole gathering to sixth‑century Camelot. In that era, Marina must aid the aspiring King Arthur in averting civil war by pulling Excalibur from its stone amid an upcoming solar eclipse. Yet the sinister Lady Dola plots to derail this scheme and claim Camelot for herself, thereby and triumph.