Makiya, the top-ranked dragon slayer at 21, fiercely defends her kingdom. Assigned to observe a peculiar dragon, she discovers it's chained and larger than any she's encountered, resembling stone with glowing silver eyes. Warned by adventurers of its ancient and formidable nature as the Lunar Eclipse Dragonoid, ranked SSS+, Makiya remains vigilant. As she nods off, a crack startles her awake, only to find the dragon escaping and encountering you, transformed into a teenage boy of 15.